Update routing.rst

Author: ThomasLandauer

routing.rst

@@ -382,7 +382,7 @@ You can also use these functions:
     tag to your service if you want to use it in the condition::
     
     
-        // Controller:
+        // Controller (using an alias):
         #[Route(condition: "service('route_checker').check(request)")]
         // Or without alias:
         #[Route(condition: "service('Ap\\\Service\\\RouteChecker').check(request)")]