[Messenger] Fix typos

Author: ogizanagi

Stamp/ReceivedStamp.php

@@ -14,7 +14,7 @@
 use Symfony\Component\Messenger\Middleware\SendMessageMiddleware;
 
 /**
- * Marker config for a received message.
+ * Marker stamp for a received message.
  *
  * This is mainly used by the `SendMessageMiddleware` middleware to identify
  * a message should not be sent if it was just received.

Tests/EnvelopeTest.php

@@ -39,7 +39,7 @@ public function testWithReturnsNewInstance()
         $this->assertNotSame($envelope, $envelope->with(new ReceivedStamp()));
     }
 
-    public function testGetLast()
+    public function testLast()
     {
         $receivedStamp = new ReceivedStamp();
         $envelope = new Envelope($dummy = new DummyMessage('dummy'), $receivedStamp);