bug #10170 fix HandlerLocator's use statement (sensorario)

This PR was merged into the 4.1 branch.

Discussion
----------

fix `HandlerLocator`'s use statement

I was just following the doc, founding this little issue. Hope this may help someone.

Commits
-------

1f35faa fix `HandlerLocator`'s use statement

Author: weaverryan

components/messenger.rst

@@ -61,7 +61,7 @@ Example::
 
     use App\Message\MyMessage;
     use Symfony\Component\Messenger\MessageBus;
-    use Symfony\Component\Messenger\HandlerLocator;
+    use Symfony\Component\Messenger\Handler\Locator\HandlerLocator;
     use Symfony\Component\Messenger\Middleware\HandleMessageMiddleware;
 
     $bus = new MessageBus([