[Messenger] Transports in separate packages

Author: Nyholm

messenger.rst

@@ -730,6 +730,14 @@ options.
 AMQP Transport
 ~~~~~~~~~~~~~~
 
+.. versionadded:: 5.1
+
+    The AMQP transport has moved to a separate package. Install it by running
+
+    .. code-block:: terminal
+
+        $ composer require symfony/amqp-messenger
+
 The ``amqp`` transport configuration looks like this:
 
 .. code-block:: bash
@@ -775,6 +783,14 @@ your Envelope::
 Doctrine Transport
 ~~~~~~~~~~~~~~~~~~
 
+.. versionadded:: 5.1
+
+    The Doctrine transport has moved to a separate package. Install it by running
+
+    .. code-block:: terminal
+
+        $ composer require symfony/doctrine-messenger
+
 The Doctrine transport can be used to store messages in a database table.
 
 .. code-block:: bash
@@ -877,6 +893,14 @@ auto_setup          Whether the table should be created
 Redis Transport
 ~~~~~~~~~~~~~~~
 
+.. versionadded:: 5.1
+
+    The Redis transport has moved to a separate package. Install it by running
+
+    .. code-block:: terminal
+
+        $ composer require symfony/redis-messenger
+
 The Redis transport uses `streams`_ to queue messages.
 
 .. code-block:: bash