fixing doc string

app.py

@@ -22,7 +22,12 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 @tool
 def arxiv_fetch_paper_tool(arxiv_id : str) -> str:
-    """ An Tool that would fetch research papers from ArXiV collection and parse it and return the PDF text"""
+    """ An Tool that would fetch research papers from ArXiV collection and parse it and return the PDF text
+    Args:
+        arxiv_id : id for the arxiv paper
+    Returns:
+    text of the paper content and title of the paper
+    """
     loader = ArxivLoader(query=arxiv_id)
     docs = loader.load()
     title = docs[0].metadata.get("title", "this paper")