minor #18092 Update forwarding.rst (94noni)

This PR was squashed before being merged into the 5.4 branch.

Discussion
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Update forwarding.rst

some code clean, (and add comment to which file we are talking of)

Commits
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f767aa9 Update forwarding.rst

Author: OskarStark

controller/forwarding.rst

@@ -14,7 +14,7 @@ and calls the defined controller. The ``forward()`` method returns the
 :class:`Symfony\\Component\\HttpFoundation\\Response` object that is returned
 from *that* controller::
 
-    public function index($name)
+    public function index($name): Response
     {
         $response = $this->forward('App\Controller\OtherController::fancy', [
             'name'  => $name,
@@ -29,7 +29,7 @@ from *that* controller::
 The array passed to the method becomes the arguments for the resulting controller.
 The target controller method might look something like this::
 
-    public function fancy($name, $color)
+    public function fancy(string $name, string $color): Response
     {
         // ... create and return a Response object
     }