fixed joker bug in docstring

app.py

@@ -9,12 +9,12 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def joker(first_name:str, last_name:int)-> str: #it's import to specify the return type
+def joker(first_name:str, last_name: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
     """Tells a joke to make someone laugh. It'll address the audience by name given.
     Args:
         first_name: the first name of the audience
-        fast_name: the last name of the audience
+        last_name: the last name of the audience
     """
     return f"Hi {first_name} {last_name} heres a joke and now laugh!!!"