Fix a comment typo

Author: vadim-su

src/galaxy/api/plugin.py

@@ -300,7 +300,7 @@ def update_game(self, game: Game) -> None:
     def unlock_achievement(self, game_id: str, achievement: Achievement) -> None:
         """Notify the client to unlock an achievement for a specific game.
 
-        :param game_id: the of the game for which to unlock an achievement.
+        :param game_id: the id of the game for which to unlock an achievement.
         :param achievement: achievement to unlock.
         """
         params = {