Fix: Correct cancellation token usage in UserProxyAgent docstring (#4874

)

Co-authored-by: Jack Gerrits <[email protected]>

python/packages/autogen-agentchat/src/autogen_agentchat/agents/_user_proxy_agent.py

@@ -98,7 +98,7 @@ async def cancellable_user_agent():
                     agent_task = asyncio.create_task(
                         agent.on_messages(
                             [TextMessage(content="What is your name? ", source="user")],
-                            cancellation_token=CancellationToken(),
+                            cancellation_token=token,
                         )
                     )
                     response = await agent_task