Further release tweaks

[James Bruten (james-bruten-mo)]

PR Summary

Code Reviewer: Jenny Hickson (@jennyhickson)

Some additional changes to the release instructions:

• umdp3 release clarification
• add missed repos to list of repos to tag
• additional hotfix setting change

Code Quality Checklist

• I have performed a self-review of my own code
• I have locally built the documentation successfully, and the output of changed sections is as expected

Code Review

• The changes are coherent and valid