Following up on the conversation in #11604 (comment), developers would benefit from some documentation on how to use block editor notices.

I've started a draft in this Dropbox Paper document: https://paper.dropbox.com/doc/Using-notices-in-the-block-editor--AWl6LauVA0RqsUxyGQBY~W~dAg-PlWYEgAxvNn1e4ul5Ba42

Feel free to leave comments directly. Or, if you'd like to help collaborate, ping me on WordPress.org Slack with your Dropbox account email address.

Once this document is in a mostly final state, I'll submit it as a pull request to wherever it needs to go.