Document error communication with community

[jsjoeio]

We had an issue with our release process last week (see regression report) and failed to communicate this to the community.

We want to improve that by:

• creating a process for communicating errors to community
• documenting in docs/MAINTAINERS_HANDBOOK.md

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no activity occurs in the next 5 days.