Issue on docs

[aonix-group]

Path: /introduction/multi-agent-systems

Issue: The cached response example is displaying empty content when cache hit occurs.

Problem:
The current code in the workflow example uses RunResponse for cached responses, but pprint_run_response expects streaming events (RunResponseContentEvent) to display content properly.

Current code (incorrect):

yield RunResponse(run_id=self.run_id, content=self.session_state.get(message))

Expected code (fix):

yield RunResponseContentEvent(run_id=self.run_id, content=self.session_state.get(message))