message: Fix input example.
diff: @@ -103,21 +103,21 @@ impl event::EventHandler for MainState {
  println!("Text input: {}", ch);
  }
  - fn controller_button_down_event(&mut self, _ctx: &mut Context, btn: Button, id: GamepadId) {
  + fn gamepad_button_down_event(&mut self, _ctx: &mut Context, btn: Button, id: GamepadId) {
  println!(
  "Gamepad button pressed: {:?} Gamepad_Id: {:?}",
  btn, id
  );
  }
  - fn controller_button_up_event(&mut self, _ctx: &mut Context, btn: Button, id: GamepadId) {
  + fn gamepad_button_up_event(&mut self, _ctx: &mut Context, btn: Button, id: GamepadId) {
  println!(
  "Gamepad button released: {:?} Gamepad_Id: {:?}",
  btn, id
  );
  }
  - fn controller_axis_event(&mut self, _ctx: &mut Context, axis: Axis, value: f32, id: GamepadId) {
  + fn gamepad_axis_event(&mut self, _ctx: &mut Context, axis: Axis, value: f32, id: GamepadId) {
  println!(
  "Axis Event: {:?} Value: {} Gamepad_Id: {:?}",
  axis, value, id
  