Fix the referencing of the redis transport in an explanation

Author: danrot

messenger.rst

@@ -709,7 +709,7 @@ and ``user`` to the Unix user on your server.
 If you use the Redis Transport, note that each worker needs a unique consumer
 name to avoid the same message being handled by multiple workers. One way to
 achieve this is to set an environment variable in the Supervisor configuration
-file, which you can then refer to in ``messenger.yaml`` (see Redis section above):
+file, which you can then refer to in ``messenger.yaml`` (see Redis section below):
 
 .. code-block:: ini