minor #11096 Improved the explanation about the forward method (javiereguiluz)

This PR was merged into the 4.2 branch.

Discussion
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Improved the explanation about the forward method

This fixes #11095 differently.

Commits
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ecaa7da Improved the explanation about the forward method

Author: javiereguiluz

controller/forwarding.rst

@@ -5,10 +5,14 @@ How to Forward Requests to another Controller
 =============================================
 
 Though not very common, you can also forward to another controller internally
-with the :method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\AbstractController::forward`
-method. Instead of redirecting the user's browser, this makes an "internal"
-sub-request and calls the defined controller. The ``forward()`` method returns
-the :class:`Symfony\\Component\\HttpFoundation\\Response` object that is returned
+with the ``forward()`` method provided by the
+:class:`Symfony\\Bundle\\FrameworkBundle\\Controller\\AbstractController` class
+(or :class:`Symfony\\Bundle\\FrameworkBundle\\Controller\\ControllerTrait` if
+your controller doesn't extend from ``AbstractController``).
+
+Instead of redirecting the user's browser, this makes an "internal" sub-request
+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)