Document the changes to the 'Your Review' button

Problem to solve

The 'your review' button was added / moved in Move "Your review" button to the right (#538091 - closed) while I was OOO, and needs to be documented.

Other links/references

• Related to Move "Your review" button to the right (#538091 - closed)
• Related to [Feature Flag] Rollout of `improved_review_expe... (#535461 - closed) ?
• Related to Move review button to the right (!189713 - merged)