minor #17369 [Translation] Add new cases covered by PhpAstExtractor (welcoMattic)

This PR was merged into the 6.2 branch.

Discussion
----------

[Translation] Add new cases covered by PhpAstExtractor

In symfony/symfony#46161, we rewrite the PHP Translation extractor. It covers more cases, like named arguments.
Documentation needed to be updated consequently.

Commits
-------

5029cb2 Add new cases covered by PhpAstExtractor

Author: javiereguiluz

translation.rst

@@ -476,6 +476,8 @@ The ``translation:extract`` command looks for missing translations in:
 * Any PHP file/class stored in the ``src/`` directory that creates
   :ref:`translatable-objects` using the constructor or the ``t()`` method or calls
   the ``trans()`` method.
+* Any PHP file/class stored in the ``src/`` directory that uses
+  :ref:`Constraints Attributes <validation-constraints>`  with ``*message`` named argument(s).
 
 .. _translation-resource-locations: