minor #18851 [Messenger] Reword note about Enqueue (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
----------

[Messenger] Reword note about Enqueue

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `6.x` for features of unreleased versions).

-->

Commits
-------

5eac02f [Messenger] Reword note about Enqueue

Author: javiereguiluz

messenger.rst

@@ -124,7 +124,8 @@ is capable of sending messages (e.g. to a queueing system) and then
 .. note::
 
     If you want to use a transport that's not supported, check out the
-    `Enqueue's transport`_, which supports things like Kafka and Google Pub/Sub.
+    `Enqueue's transport`_, which backs services like Kafka and Google
+    Pub/Sub.
 
 A transport is registered using a "DSN". Thanks to Messenger's Flex recipe, your
 ``.env`` file already has a few examples.