7.3.0: sphinx warnings reference target not found

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v4.5.0
Initializing GitHub plugin
making output directory... done
myst v0.17.1: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions=['html_image'], linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', disable_syntax=[], all_links_external=False, url_schemes=['http', 'https', 'mailto', 'ftp'], ref_domains=None, highlight_code_blocks=True, number_code_blocks=[], title_to_header=False, heading_anchors=None, heading_slug_func=None, html_meta=[], footnote_transition=True, substitutions=[], sub_delimiters=['{', '}'], words_per_minute=200)
loading intersphinx inventory from http://ipython.readthedocs.io/en/stable/objects.inv...
intersphinx inventory has moved: http://ipython.readthedocs.io/en/stable/objects.inv -> https://ipython.readthedocs.io/en/stable/objects.inv
building [mo]: targets for 0 po files that are out of date
building [man]: all manpages
updating environment: [new config] 13 added, 0 changed, 0 removed
reading sources... [100%] wrapperkernels
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... python-jupyter-client.3 { messaging kernels wrapperkernels provisioning pending-kernels api/index api/kernelspec api/manager api/client api/provisioners changelog migration } /home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/messaging.rst:50: WARNING: py:func reference target not found: print
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/messaging.rst:61: WARNING: py:func reference target not found: raw_input
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/messaging.rst:260: WARNING: py:class reference target not found: jupyter_client.session.Session
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/messaging.rst:265: WARNING: py:class reference target not found: jupyter_client.session.Session
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/kernels.rst:128: WARNING: 'envvar' reference target not found: JUPYTER_PATH
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/wrapperkernels.rst:26: WARNING: py:class reference target not found: ipykernel.kernelbase.Kernel
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/wrapperkernels.rst:63: WARNING: py:func reference target not found: raw_input
/usr/lib/python3.8/site-packages/ipykernel/kernelbase.py:docstring of ipykernel.kernelbase.Kernel.send_response:3: WARNING: py:meth reference target not found: jupyter_client.session.Session.send
/usr/lib/python3.8/site-packages/ipykernel/kernelbase.py:docstring of ipykernel.kernelbase.Kernel.send_response:6: WARNING: py:meth reference target not found: set_parent
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:83: WARNING: py:class reference target not found: KernelProvisionerBase
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:167: WARNING: py:class reference target not found: KernelProvisionerBase
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:167: WARNING: py:meth reference target not found: poll
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:167: WARNING: py:meth reference target not found: wait
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:177: WARNING: py:class reference target not found: KernelProvisionerBase
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:177: WARNING: py:class reference target not found: subprocess.Popen
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:193: WARNING: py:class reference target not found: KernelProvisionerBase
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:193: WARNING: py:class reference target not found: LocalProvisioner
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:237: WARNING: py:meth reference target not found: poll
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:237: WARNING: py:meth reference target not found: kill
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/provisioning.rst:242: WARNING: py:meth reference target not found: get_shutdown_wait_time
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/api/manager.rst:14: WARNING: py:class reference target not found: LocalProvisioner
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/api/manager.rst:26: WARNING: py:mod reference target not found: jupyter_client.client
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/multikernelmanager.py:docstring of jupyter_client.multikernelmanager.MultiKernelManager.get_kernel:: WARNING: py:class reference target not found: uuid
/usr/lib/python3.8/site-packages/jupyter_client/manager.py:docstring of jupyter_client.manager.run_kernel:: WARNING: py:class reference target not found: connected KernelClient instance
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient:11: WARNING: py:meth reference target not found: get_shell_msg
/usr/lib/python3.8/site-packages/jupyter_client/connect.py:docstring of jupyter_client.connect.ConnectionFileMixin.load_connection_file:: WARNING: py:class reference target not found: unicode
/usr/lib/python3.8/site-packages/jupyter_client/connect.py:docstring of jupyter_client.connect.ConnectionFileMixin.load_connection_file:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.start_channels:3: WARNING: py:meth reference target not found: start_kernel
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: default False
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: default True
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:11: WARNING: py:func reference target not found: repr
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: default self.allow_stdin
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: default True
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.execute:: WARNING: py:class reference target not found: The msg_id of the message sent.
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.complete:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.complete:: WARNING: py:class reference target not found: The msg_id of the message sent.
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.inspect:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.inspect:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.inspect:: WARNING: py:class reference target not found: The msg_id of the message sent.
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.history:: WARNING: py:class reference target not found: The ID of the message sent.
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.comm_info:: WARNING: py:class reference target not found: The msg_id of the message sent
/usr/lib/python3.8/site-packages/jupyter_client/client.py:docstring of jupyter_client.client.KernelClient.shutdown:: WARNING: py:class reference target not found: The msg_id of the message sent
/usr/lib/python3.8/site-packages/jupyter_client/blocking/client.py:docstring of jupyter_client.blocking.client.BlockingKernelClient:3: WARNING: py:exc reference target not found: queue.Empty
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: default False
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: default True
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:19: WARNING: py:func reference target not found: repr
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: default self.allow_stdin
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: optional
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: default True
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: default: None
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: callable
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: msg
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: callable
/usr/lib/python3.8/site-packages/jupyter_client/utils.py:docstring of jupyter_client.utils.run_sync.<locals>.wrapped:: WARNING: py:class reference target not found: msg
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/provisioner_base.py:docstring of jupyter_client.provisioning.provisioner_base.KernelProvisionerBase:7: WARNING: py:class reference target not found: subprocess.Popen
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/provisioner_base.py:docstring of jupyter_client.provisioning.provisioner_base.KernelProvisionerBase.poll:3: WARNING: py:meth reference target not found: KernelManager.is_alive
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/local_provisioner.py:docstring of jupyter_client.provisioning.local_provisioner.LocalProvisioner:1: WARNING: py:class reference target not found: KernelProvisionerBase
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/local_provisioner.py:docstring of jupyter_client.provisioning.local_provisioner.LocalProvisioner:1: WARNING: py:class reference target not found: subprocess.Popen
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/factory.py:docstring of jupyter_client.provisioning.factory.KernelProvisionerFactory:3: WARNING: py:class reference target not found: KernelSpecManager
/usr/lib/python3.8/site-packages/jupyter_client/provisioning/factory.py:docstring of jupyter_client.provisioning.factory.KernelProvisionerFactory:8: WARNING: py:class reference target not found: LocalProvisioner
/home/tkloczko/rpmbuild/BUILD/jupyter_client-7.3.0/docs/kernels.rst:: WARNING: "table cell spanning" not supported
done
build succeeded, 74 warnings.