[DependencyInjection] Return hint

Remove uses & Route attribute

Author: mohamedGasmii

service_container.rst

@@ -370,13 +370,10 @@ you can type-hint the new ``SiteUpdateManager`` class and use it::
     namespace App\Controller;
 
     use App\Service\SiteUpdateManager;
-    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
-    use Symfony\Component\HttpFoundation\Response;
-    use Symfony\Component\Routing\Annotation\Route;
+    // ...
 
     class SiteController extends AbstractController
     {
-        #[Route('/site/new')]
         public function new(SiteUpdateManager $siteUpdateManager): Response
         {
             // ...