Merge pull request #281 from danieltj27/ticket/1430

[ticket/1430] fix the order of use and namespace keywords in extension document

Author: iMattPro

development/extensions/tutorial_controllers.rst

@@ -44,10 +44,10 @@ Every controller should contain at least two methods:
 
     <?php
 
-    use \Symfony\Component\HttpFoundation\Response;
-
     namespace acme\demo\controller;
 
+    use \Symfony\Component\HttpFoundation\Response;
+
     class main
     {
         /* @var \phpbb\config\config */