message: Update docs on key_down_event()
diff: @@ -90,6 +90,11 @@ pub trait EventHandler {
  fn mouse_wheel_event(&mut self, _ctx: &mut Context, _x: f32, _y: f32) {}
  /// A keyboard button was pressed.
  + ///
  + /// The default implementation of this will call `ggez::quit()`
  + /// when the escape key is pressed. If you override this with
  + /// your own event handler you have to re-implment that
  + /// functionality yourself.
  fn key_down_event(
  &mut self,
  ctx: &mut Context,
  