Removed old versionadded directives

Author: OskarStark

mailer.rst

@@ -273,10 +273,6 @@ transports, which is useful to debug errors.
     ID of the message (being the original random ID generated by Symfony or the
     new ID generated by the mailer provider).
 
-    .. versionadded:: 4.4
-
-        The ``getMessageId()`` method was introduced in Symfony 4.4.
-
 The exceptions related to mailer transports (those which implement
 :class:`Symfony\\Component\\Mailer\\Exception\\TransportException`) also provide
 this debug information via the ``getDebug()`` method.

service_container.rst

@@ -787,10 +787,6 @@ constructor arguments without any configuration.
 Linting Service Definitions
 ---------------------------
 
-.. versionadded:: 4.4
-
-    The ``lint:container`` command was introduced in Symfony 4.4.
-
 The ``lint:container`` command checks that the arguments injected into services
 match their type declarations. It's useful to run it before deploying your
 application to production (e.g. in your continuous integration server):