fix comment

src/game.rs

@@ -441,7 +441,7 @@ impl Game {
         new_id
     }
 
-    /// adds a sprite safely and returns the new sprite ID
+    /// adds an item safely and returns the new item ID
     #[inline]
     pub fn add_item(&mut self, mut item: Item) -> String {
         let new_id = self.new_item_id();