Added alternative syntax using getClickedButton()

Author: ThomasLandauer

form/multiple_buttons.rst

@@ -31,3 +31,10 @@ querying if the "Save and add" button was clicked::
 
         return $this->redirectToRoute($nextAction);
     }
+    
+Or you can get the button's name by using the 
+:method:`Symfony\\Component\\Form\\Form::getClickedButton` method of the form::
+    
+    if ($form->getClickedButton()->getName()==='saveAndAdd')    
+    
+