bug symfony#6800 Fix missing function name (JosefVitu)

This PR was merged into the 2.7 branch. Discussion ---------- Fix missing function name Example in the 'Handling Form Submissions' section was invalid, as the name of a function to be called (isValid) was missing. Commits ------- 6ed019e Fix missing function name

Author: wouterj

forms.rst

@@ -234,7 +234,7 @@ your controller::
 
  $form->handleRequest($request);
 
- if ($form->isSubmitted() && $form->()) {
+ if ($form->isSubmitted() && $form->isValid()) {
  // $form->getData() holds the submitted values
  // but, the original `$task` variable has also been updated
  $task = $form->getData();