message: Fix documentation examples of `UserInterface`
diff: @@ -162,7 +162,7 @@ where
  /// );
  ///
  /// // Update the user interface
  - /// let messages = user_interface.update(&renderer, None, events.drain(..));
  + /// let messages = user_interface.update(events.drain(..), None, &renderer);
  ///
  /// cache = user_interface.into_cache();
  ///
  @@ -246,7 +246,7 @@ where
  /// &mut renderer,
  /// );
  ///
  - /// let messages = user_interface.update(&renderer, None, events.drain(..));
  + /// let messages = user_interface.update(events.drain(..), None, &renderer);
  ///
  /// // Draw the user interface
  /// let mouse_cursor = user_interface.draw(&mut renderer);
  