Enhance documentation of HandleTrait::handle

Author: Fan2Shrek

messenger.rst

@@ -2512,11 +2512,16 @@ wherever you need a query bus behavior instead of the ``MessageBusInterface``::
         }
     }
 
-You also can also specify stamps when handling a message. For example, you can
+You also can also add stamps when handling a message. For example, you can
 add an ``DoctrineFlushStamp`` to flush the entity manager after handling the message::
 
     $this->handle(new SomeMessage($data), [new DoctrineFlushStamp()]);
 
+.. note::
+
+    If adding a stamp of the same type that already exists in the envelope,
+    both stamps will be kept (see `Envelopes & Stamps`_).
+
 .. versionadded:: 7.3
 
     The ``$stamps`` parameter on the handle method was introduced in Symfony 7.3.