#11272 extend example for createNamed function

Author: wimme002

forms.rst

@@ -680,13 +680,17 @@ choice is ultimately up to you.
 
         // src/AppBundle/Controller/DefaultController.php
         use AppBundle\Form\TaskType;
+        use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 
-        public function newAction()
+        class DefaultController extends AbstractController 
         {
-            $task = ...;
-            $form = $this->container->get('form.factory')->createNamed('name', TaskType::class, $task);
+            public function newAction()
+            {
+                $task = ...;
+                $form = $this->get('form.factory')->createNamed('name', TaskType::class, $task);
 
-            // ...
+                // ...
+            }
         }
 
     You can even suppress the name completely by setting it to an empty string.