message: Fix example in documentation of timer::check_update_time
diff: @@ -203,7 +203,7 @@ pub fn get_time_since_start(ctx: &Context) -> time::Duration {
  ///
  /// ```rust,ignore
  /// fn update(&mut self, ctx: &mut Context) -> GameResult<()>
  -/// while(timer::get_time_since_start(ctx, 60)) {
  +/// while(timer::check_update_time(ctx, 60)) {
  /// update_game_physics()?;
  /// }
  /// Ok(())
  