[Messenger] Fix issues found by CI

Author: Valentin Nazarov

messenger/message_priority.rst

@@ -4,7 +4,7 @@ Message Priority
 By default messenger uses the first in, first out principle: messages will be
 received in the same order they were sent (except the delayed ones).
 
-Basic priority can be achieved by using :doc:`prioritized transports </messenger.rst>`,
+Basic priority can be achieved by using :doc:`prioritized transports </messenger>`,
 but only for different message types.
 
 With AMQP and Beanstalkd transports, you can have a priority queue for messages
@@ -24,8 +24,8 @@ of the same type::
 Priority can be used together with delay::
 
     use Symfony\Component\Messenger\Envelope;
-    use Symfony\Component\Messenger\Stamp\PriorityStamp;
     use Symfony\Component\Messenger\Stamp\DelayStamp;
+    use Symfony\Component\Messenger\Stamp\PriorityStamp;
 
     $bus->dispatch(
         (new Envelope($message))->with(