Update app.py

Had nonsense value being returned from function, updated.

app.py

@@ -30,7 +30,7 @@ def webpage_contents_get(url:str)-> str: #it's import to specify the return type
     """
     response = requests.get(url)
     html_content = response.text
-    return webpage_contents_get
+    return html_content
 
 
 @tool