Removing extra use statement that didn't change for this code block

(and so doesn't need to be mentioned). Thanks to a user by comments: https://knpuniversity.com/screencast/symfony2-ep3/content-type-jsonresponse#comment-2277755237
knpuniversity · Sep 28, 2015 · 7b46911 · 7b46911
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commit 7b46911
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diff --git a/knpu/episode3/content-type-jsonresponse.rst b/knpu/episode3/content-type-jsonresponse.rst
@@ -149,7 +149,6 @@ in ``attendAction`` and ``unattendAction`` and return its value.
 We can use this function to easily generate the JSON response for both controllers::
 
     // src/Yoda/EventBundle/Controller/EventController.php
-    use Symfony\Component\HttpFoundation\Request;
     // ...
 
     public function attendAction($id, $format)