minor #10673 delete var_dump() functions in examples (JakubSzczesniak)

This PR was submitted for the 4.1 branch but it was merged into the 2.8 branch instead (closes #10673). Discussion ---------- delete var_dump() functions in examples Commits ------- 04501ea delete var_dump() functions in examples

Author: javiereguiluz

components/event_dispatcher/generic_event.rst

@@ -76,8 +76,6 @@ access the event arguments::
  );
  $dispatcher->dispatch('foo', $event);
 
- var_dump($event['counter']);
-
  class FooListener
  {
  public function handler(GenericEvent $event)
@@ -97,8 +95,6 @@ Filtering data::
  $event = new GenericEvent($subject, array('data' => 'Foo'));
  $dispatcher->dispatch('foo', $event);
 
- var_dump($event['data']);
-
  class FooListener
  {
  public function filter(GenericEvent $event)