Update docstring

app.py

@@ -164,8 +164,8 @@ def play_chess(
     Instructions for LLMs:
         Prerequisites:
             - User must be asked if they want to play as white or black.
-                - If user chooses black, pass an empty string in the first move for the engine to play as white.
-                - If the user chooses white, ask the user for a move and pass it in the first move for the engine to play as black.
+                - If user chooses black, pass an empty string in the first move (for the engine to play as white).
+                - If the user chooses white, LLMs must ask the user for a move and pass it in the first move (for the engine to play as black).
 
             - User must be asked if they want a board drawn.
                 - If they do, pass `draw_board=True` to this function.