Added shortcut methods for controllers

Author: Cydonia7

book/controller.rst

@@ -459,6 +459,10 @@ perform a 301 (permanent) redirect, modify the second argument::
 
         return new RedirectResponse($this->generateUrl('homepage'));
 
+    You can also directly use ``redirectToRoute()`` and give it directly the route name like :
+
+        return $this->redirectToRoute('homepage');
+
 .. index::
    single: Controller; Rendering templates
 
@@ -638,8 +642,13 @@ After processing the request, the controller sets a ``notice`` flash message
 in the session and then redirects. The name (``notice``) isn't significant -
 it's just something you invent and reference next.
 
-In the template of the next page (or even better, in your base layout template),
-the following code will render the ``notice`` message:
+.. tip::
+
+    You can use the ``addFlash()`` method as a shortcut to
+    ``$this->get('session')->getFlashBag()->add()``.
+
+In the template of the next action, the following code could be used to render
+the ``notice`` message:
 
 .. configuration-block::