minor #3977 [WCM] removed call to deprecated getRequest() method (Bap…

…touuuu)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #3977).

Discussion
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[WCM] removed call to deprecated getRequest() method

| Q                  | A
| ---------------- | ---
| Doc fix?        | yes
| New docs?   | no
| Applies to     | 2.5+
| Fixed tickets |

Commits
-------

0fbb1e0 removed call to deprecated getRequest() method

book/templating.rst

@@ -1500,9 +1500,9 @@ In many cases, you may want to allow a single controller to render multiple
 different formats based on the "request format". For that reason, a common
 pattern is to do the following::
 
-    public function indexAction()
+    public function indexAction(Request $request)
     {
-        $format = $this->getRequest()->getRequestFormat();
+        $format = $request->getRequestFormat();
 
         return $this->render('AcmeBlogBundle:Blog:index.'.$format.'.twig');
     }