[AndrewFerr]

Reminder PR for adding documentation for the unstable config options added by #20229 & #19038 once they become stable.

Pull Request Checklist

• Pull request is based on the develop branch
• Pull request includes a changelog file. The entry should:
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  • Use markdown where necessary, mostly for code blocks.
  • End with either a period (.) or an exclamation mark (!).
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• Code style is correct (run the linters)