minor #12952 [Yaml] Documented the yaml-lint binary (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #12952).

Discussion
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[Yaml] Documented the yaml-lint binary

Fixes #12935.

Commits
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b6dcce0 [Yaml] Documented the yaml-lint binary

Author: javiereguiluz

translation/lint.rst

@@ -32,3 +32,16 @@ The linter results can be exported to JSON using the ``--format`` option:
 
     $ php bin/console lint:yaml translations/ --format=json
     $ php bin/console lint:xliff translations/ --format=json
+
+.. tip::
+
+    The Yaml component provides a stand-alone ``yaml-lint`` binary to lint YAML
+    files without using the entire Symfony console application:
+
+    .. code-block:: terminal
+
+        $ php vendor/bin/yaml-lint translations/
+
+    .. versionadded:: 5.1
+
+        The ``yaml-lint`` binary was introduced in Symfony 5.1.