messenger: allow to close connection

Author: MrYamous

messenger.rst

@@ -2254,6 +2254,20 @@ on a case-by-case basis via the :class:`Symfony\\Component\\Messenger\\Stamp\\Se
     provides that control. See `SymfonyCasts' message serializer tutorial`_ for
     details.
 
+Closing connection
+~~~~~~~~~~~~~~~~~~
+
+When using a transport that requires a connection, you can close it using
+the :method:`Symfony\\Component\\Messenger\\Transport\\CloseableTransportInterface::close`
+method to allow free resources for long-running processes.
+
+This interface is implemented by the following transports: AmazonSqs, Amqp and Redis.
+If you want to close a Doctrine connection, this can be achieved :ref:`using middleware <middleware-for-doctrine>`.
+
+.. versionadded:: 7.3
+
+    The ``CloseableTransportInterface`` and ``close`` method were introduced in Symfony 7.3.
+
 Running Commands And External Processes
 ---------------------------------------