[Messenger] Priority support for Beanstalkd bridge

Adds explanation about the new `BeanstalkdPriorityStamp` introduced by symfony/symfony#59273
Fixes #20513

Author: Spomky

messenger.rst

@@ -1789,6 +1789,29 @@ The transport has a number of options:
 
     Keepalive support, using the ``--keepalive`` option, was added in Symfony 7.2.
 
+When using the Beanstalkd transport in Symfony Messenger, you can now set the priority of the messages being dispatched.
+This allows you to control the order in which the messages are processed, with lower values indicating higher priority.
+
+To configure the priority, use the ``Symfony\Component\Messenger\Bridge\Beanstalkd\Transport\BeanstalkdPriorityStamp``
+when dispatching a message:
+
+.. code-block:: php
+
+    use App\Message\SomeMessage;
+    use Symfony\Component\Messenger\Stamp\BeanstalkdPriorityStamp;
+
+    $this->bus->dispatch(new SomeMessage('some data'), [
+        new BeanstalkdPriorityStamp(0), // Highest priority
+    ]);
+
+As defined by the Beanstalkd protocol, the priority value must be an integer between 0 (highest priority) and 2**32 (lowest priority).
+
+If no priority is specified, the default value ``1024`` will be used.
+
+.. versionadded:: 7.3
+
+    ``BeanstalkdPriorityStamp`` support was added in Symfony 7.3.
+
 .. _messenger-redis-transport:
 
 Redis Transport