minor symfony#9532 Update rendering.rst (atailouloute)

This PR was submitted for the 4.0 branch but it was merged into the 2.7 branch instead (closes symfony#9532).

Discussion
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Update rendering.rst

Commits
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6be8a00 Update rendering.rst

Author: xabbuh

form/rendering.rst

@@ -21,7 +21,7 @@ of code. Of course, you'll usually need much more flexibility when rendering:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/default/newAction.html.php -->
+        <!-- app/Resources/views/default/new.html.php -->
         <?php echo $view['form']->start($form) ?>
             <?php echo $view['form']->errors($form) ?>