Add a versionadded directive

Author: javiereguiluz

service_container/debug.rst

@@ -51,3 +51,9 @@ its id:
 .. code-block:: terminal
 
     $ php bin/console debug:container App\Service\Mailer
+
+.. versionadded:: 7.3
+
+    Starting in Symfony 7.3, this command displays the service arguments by default.
+    In earlier Symfony versions, you needed to use the ``--show-arguments`` option,
+    which is now deprecated.