minor #8509 Added info about deprecation reporting of YAML lint command (hiddewie)

This PR was merged into the 3.3 branch.

Discussion
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Added info about deprecation reporting of YAML lint command

Fixes #7780.

It seems useful to add a use case for the reporting, I've added a line about finding deprecations during automated testing.

Commits
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47a18e5 Added info about deprecation reporting of YAML lint command

Author: xabbuh

components/yaml.rst

@@ -368,6 +368,12 @@ Add the ``--format`` option to get the output in JSON format:
 
     $ php lint.php path/to/file.yml --format json
 
+.. tip::
+
+    The linting command will also report any deprecations in the checked
+    YAML files. This may for example be useful for recognizing deprecations of
+    contents of YAML files during automated tests.
+
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