updated 'prompt' argument in web_search function

app.py

@@ -22,7 +22,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 def web_search(prompt: str) -> str:
     """ A tool that searches a given prompt from the internet and returns best 5 results
     Args:
-        prompt (str): the query the user inputs 
+        prompt: the query the user inputs (e.g., what is the biggest country in the world).
     """
     search_tool = DuckDuckGoSearchTool(max_results=5) 
     return search_tool(prompt)