fix app.py

app.py

@@ -79,8 +79,8 @@ def chat_gen(message, history, return_buffer=True):
             yield buffer
         
         buffer += "I use the following websites data to generate the above answer: \n"
-        for docs in retrieved_docs:
-            buffer += f'{docs['metadata']['source']}\n'
+        for doc in retrieved_docs:
+            buffer += f'{doc['metadata']['source']}\n'
     else:
       passage = "I am sorry. I do not have relevant information to answer on that specific topic. Please try another question."
       buffer += passage