message: Fix typo in graphics::spritebatch::SpriteBatch::add() docs
diff: @@ -59,7 +59,7 @@ impl SpriteBatch {
  /// Adds a new sprite to the sprite batch.
  ///
  - /// Returns a handle with whictypeh to modify the sprite using `set()`
  + /// Returns a handle with which type to modify the sprite using `set()`
  pub fn add(&mut self, param: graphics::DrawParam) -> SpriteIdx {
  self.sprites.push(param);
  SpriteIdx(self.sprites.len() - 1)
  