minor symfony#7564 Removed tip that was meant for the 2.x versions (iltar)

This PR was merged into the 3.2 branch.

Discussion
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Removed tip that was meant for the 2.x versions

`getRequest()` was removed from the Controller class back in 3.0 already. I could not find a reference on this page to `getRequest` either way so I think it's safe to remove this tip completely.

Commits
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11f259d Removed tip that was meant for the 2.x versions

Author: xabbuh

controller/service.rst

@@ -336,12 +336,6 @@ controller:
 
         return new StreamedResponse($callback);
 
-.. tip::
-
-    ``getRequest()`` has been deprecated. Instead, have an argument to your
-    controller action method called ``Request $request``. The order of the
-    parameters is not important, but the typehint must be provided.
-
 .. _`Controller class source code`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php
 .. _`base Controller class`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php
 .. _`FrameworkExtraBundle documentation`: https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/routing.html#controller-as-service