Add deploy instructions using the command-line

Tested this to trigger the deploy of pytest-dev#11546.

scripts/prepare-release-pr.py

@@ -31,16 +31,22 @@ class InvalidFeatureRelease(Exception):
 SLUG = "pytest-dev/pytest"
 
 PR_BODY = """\
-Created by the [prepare release pr](https://github.com/pytest-dev/pytest/actions/workflows/prepare-release-pr.yml)
-workflow.
+Created by the [prepare release pr]\
+(https://github.com/pytest-dev/pytest/actions/workflows/prepare-release-pr.yml) workflow.
 
-Once all builds pass and it has been **approved** by one or more maintainers,
-start the [deploy](https://github.com/pytest-dev/pytest/actions/workflows/deploy.yml) workflow, using these parameters:
+Once all builds pass and it has been **approved** by one or more maintainers, start the \
+[deploy](https://github.com/pytest-dev/pytest/actions/workflows/deploy.yml) workflow, using these parameters:
 
 * `Use workflow from`: `release-{version}`.
 * `Release version`: `{version}`.
 
-After the `deploy` workflow has been approved by a core maintainer, the package will be uploaded to PyPI automatically.
+Or execute on the command line:
+
+```console
+gh workflow run deploy.yml -r release-{version} -f version={version}
+```
+
+After the workflow has been approved by a core maintainer, the package will be uploaded to PyPI automatically.
 """