Python: Small fixes in examples (#540)

* Fixed Ruff formatting

* Added more info to chat response cancellation example

* Improved example

* Small fix

python/samples/getting_started/agents/openai_chat_client/openai_chat_client_with_web_search.py

@@ -1,9 +1,11 @@
 # Copyright (c) Microsoft. All rights reserved.
 
 import asyncio
+
 from agent_framework import HostedWebSearchTool
 from agent_framework.openai import OpenAIChatClient
 
+
 async def main() -> None:
     client = OpenAIChatClient(ai_model_id="gpt-4o-search-preview")
 
@@ -35,5 +37,6 @@ async def main() -> None:
         )
         print(f"Assistant: {response}")
 
+
 if __name__ == "__main__":
     asyncio.run(main())