Update app.py

app.py

@@ -20,7 +20,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 @tool
 def calculate_discount_tool(product_name: str, discount_percent: int) -> str:
-    """A tool that calculates the discount on a product
+    """A tool that calculate the discount on a product
     Args:
         product_name: name of the product
         discount_percent: discount to apply in percentage