Update app.py

app.py

@@ -13,7 +13,7 @@ def web_search(search_query: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 performs web search using DuckDuckGo 
     Args:
-        arg: A string representing the search query
+        search_query: A string representing the search query
     """
     return DuckDuckGoSearchTool(search_query)