message: fixing a comment format
diff: @@ -477,7 +477,7 @@ impl event::EventHandler for GameState {
  self.snake.next_dir = Some(dir);
  } else if dir.inverse() != self.snake.last_update_dir {
  // If no new direction has been set and the direction is not the inverse
  - // of the last_update_dir, then set the snake's new direction to be the
  + // of the `last_update_dir`, then set the snake's new direction to be the
  // direction the user pressed.
  self.snake.dir = dir;
  }
  