corrected docstring

app.py

@@ -14,7 +14,7 @@ def blackjack_strategy(player_cards: list[str], dealer_card:str)-> str:
     Args:
         player_cards: A list of strings representing the player's cards.
                       Each card is represented as two character string (ex: 'AH' for Ace of hearts, '10S' for 10 of Spades).     
-        dealer_card_rank: A string representing delaler's face-up card
+        dealer_card: A string representing delaler's face-up card
 
     Returns: Recommended action ("Hit", "Stand", or "Double Down"). 
     """