Update app.py

app.py

@@ -13,7 +13,7 @@ def get_domain_name(email:str)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that extracts domain name from the specified email.
     Args:
-        arg1:email is the email address provided by the user (e.g., user@gmail.com)
+        email: a string that contains the email address provided by the user (e.g., user@gmail.com)
     """
     domain = email.split('@')[1]
     return domain