Update app.py

app.py

@@ -17,8 +17,8 @@ def calculate_historical_var(returns: np.ndarray, var_level: float = 0.95) -> fl
     Calculate the Value at Risk (VaR) using the historical method.
     
     Parameters:
-    returns (np.ndarray): Array of daily returns.
-    var_level (float): VaR level (e.g., 0.95 for 95%).
+    returns: Array of daily returns.
+    var_level: VaR level (e.g., 0.95 for 95%).
     
     Returns:
     float: VaR value.