Update app.py

Updated docstrings for required convention

app.py

@@ -47,6 +47,8 @@ def webpage_header_get(url:str)-> str: #it's import to specify the return type
 def webpage_contents_soup_links(response_content:bytes)->list:
     '''
     This function will find all links in the response.content from the webpage_contents_get tool
+    Args:
+        response_content: response.content value returned by webpage_contents_get tool.
     '''
     soup = BeautifulSoup(response.content, "html.parser")
     list_ret