Edits to internal features section

What does this MR do and why?

As the product team thought about how this guidance matched against scenarios we encounter in launching features, there was a need to provide more details about how/why and give more flexibility about when to expose features to users.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.