minor #11165 Don't use AbstractController in 3.4 branch (javiereguiluz)

This PR was merged into the 3.4 branch.

Discussion
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Don't use AbstractController in 3.4 branch

In 3.4 we always extend from Controller instead of AbstractController, so this PR fixes the wrong occurrences. The only remaining occurrence is one which explicitly explains something about AbstractController.

Commits
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a464d7e Don't use AbstractController in 3.4 branch

Author: javiereguiluz

routing/conditions.rst

@@ -15,10 +15,10 @@ define arbitrary matching logic, use the ``conditions`` routing option:
         // src/Controller/DefaultController.php
         namespace App\Controller;
 
-        use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+        use Symfony\Bundle\FrameworkBundle\Controller\Controller;
         use Symfony\Component\Routing\Annotation\Route;
 
-        class DefaultController extends AbstractController
+        class DefaultController extends Controller
         {
             /**
              * @Route(
@@ -27,7 +27,7 @@ define arbitrary matching logic, use the ``conditions`` routing option:
              *     condition="context.getMethod() in ['GET', 'HEAD'] and request.headers.get('User-Agent') matches '/firefox/i'"
              * )
              *
-             * expressions can also include config parameters 
+             * expressions can also include config parameters
              * condition: "request.headers.get('User-Agent') matches '%app.allowed_browsers%'"
              */
             public function contact()

web_link.rst

@@ -153,10 +153,10 @@ You can also add links to the HTTP response directly from controllers and servic
 
     use Fig\Link\GenericLinkProvider;
     use Fig\Link\Link;
+    use Symfony\Bundle\FrameworkBundle\Controller\Controller;
     use Symfony\Component\HttpFoundation\Request;
-    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 
-    class BlogController extends AbstractController
+    class BlogController extends Controller
     {
         public function index(Request $request)
         {