Merge pull request #1997 from Cangit/patch-1

Update components/http_foundation/introduction.rst

Author: weaverryan

components/http_foundation/introduction.rst

@@ -431,7 +431,7 @@ class, which can make this even easier::
     use Symfony\Component\HttpFoundation\JsonResponse;
 
     $response = new JsonResponse();
-    $response->setContent(array(
+    $response->setData(array(
         'data' => 123
     ));