[Messenger] Improve PHPDoc descriptions of attribute classes and parameters

Author: makmaoui

src/Symfony/Component/Messenger/Attribute/AsMessageHandler.php

@@ -20,10 +20,29 @@
 class AsMessageHandler
 {
     public function __construct(
+        /**
+         * Name of the bus from which this handler can receive messages, by default all buses.
+         */
         public ?string $bus = null,
+
+        /**
+         * Name of the transport from which this handler can receive messages, by default all transports.
+         */
         public ?string $fromTransport = null,
+
+        /**
+         * Type of messages (FQCN) that can be processed by the handler, only needed if can't be guessed by type-hint.
+         */
         public ?string $handles = null,
+
+        /**
+         * Name of the method that will process the message, only if the target is a class.
+         */
         public ?string $method = null,
+
+        /**
+         * Priority of this handler when multiple handlers can process the same message.
+         */
         public int $priority = 0,
     ) {
     }