Better explanation of implicit exception response status code

Author: hvt

reference/events.rst

@@ -215,10 +215,12 @@ and set a new ``Exception`` object, or do nothing::
  response won't work. If you want to overwrite the status code (which you
  should not without a good reason), set the ``X-Status-Code`` header::
 
- $response = Response(
+ $response = new Response(
  'Error',
- 404 // ignored,
- array('X-Status-Code' => 200)
+ 404, // this status code will be ignored
+ array(
+ 'X-Status-Code' => 200 // this status code will actually be sent to the client
+ )
  );
 
 .. seealso::