Correcting small syntaxt issues and missing url

Author: szymontrocha

install_el.rst

@@ -15,7 +15,7 @@ System Requirements
 
 Installation (Automated Script)
 ====================================
-perfSONAR provides a script that will automatically perform the first two steps in :ref:`_install_el_installation`. You can install your choice of bundle with one of the commands below.
+perfSONAR provides a script that will automatically perform the first two steps in :ref:`install_el_installation`. You can install your choice of bundle with one of the commands below.
 
 * **perfSONAR Tools**::
 

intro_about.rst

@@ -96,4 +96,5 @@ In general, no configuration is needed of the registration component but for a g
 .. _nuttcp: https://fasterdata.es.net/performance-testing/network-troubleshooting-tools/nuttcp/
 .. _traceroute: https://linux.die.net/man/8/traceroute
 .. _tracepath: https://linux.die.net/man/8/tracepath
+.. _paris-traceroute: https://paris-traceroute.net/
 .. _ping: https://linux.die.net/man/8/ping

pscheduler_batch.rst

@@ -28,7 +28,7 @@ using the ``--help`` option.
 The ``INPUT-FILE`` is a path to the input.  If not provided or is
 ``-``, input will be taken from the standard input.
 
-The final result (see :doc:`_pscheduler_batch_output`) is sent to the
+The final result (see :ref:`pscheduler_batch_output`) is sent to the
 standard output.
 
 Error and diagnostic output will be sent to standard error.