[Bugfix] fix chat pdf streamlit example (#1108)

Co-authored-by: Deven Patel <deven298@yahoo.com>

examples/chat-pdf/app.py

@@ -146,7 +146,7 @@ if prompt := st.chat_input("Ask me anything!"):
             full_response += "\n\n**Sources**:\n"
             sources = []
             for i, citation in enumerate(citations):
-                source = citation[1]
+                source = citation[1]["url"]
                 pattern = re.compile(r"([^/]+)\.[^\.]+\.pdf$")
                 match = pattern.search(source)
                 if match:

examples/private-ai/privateai.py

@@ -7,7 +7,7 @@ while True:
     user_input = input("Enter your question (type 'exit' to quit): ")
 
     # Break the loop if the user types 'exit'
-    if user_input.lower() == 'exit':
+    if user_input.lower() == "exit":
         break
 
     # Process the input and provide a response