chore: polish multi-agent example

[huangjeff5]

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[peterfriese]

This is more of a walkthrough of an existing code sample, and not a hands-on codelab.

While there is nothing wrong with a walkthrough, I would prefer giving people a hand-on experience of creating an agent system themselves, to show them how it's really done.

[huangjeff5]

This is more of a walkthrough of an existing code sample, and not a hands-on codelab.

While there is nothing wrong with a walkthrough, I would prefer giving people a hand-on experience of creating an agent system themselves, to show them how it's really done.

Makes sense. I think it will take some more work and iteration than I initially thought, so I'm going to work on this and try to simplify it and make it more hands-on, and make a separate PR.

[peterfriese]

OK to merge as a sample.