Add feedback by page view documentation

[mintlify]

Summary

• Documents the new "Feedback by page" view toggle in the feedback analytics tab
• Explains how the view aggregates thumbs up/down votes by page to show "Liked by viewers" and "Needs improvement" lists
• Helps users prioritize documentation updates based on overall page sentiment

This feature was shipped in mintlify/mint#6378.

---

Note

Low Risk
Documentation-only change with no runtime or data-handling impact; risk is limited to potential wording/accuracy issues.

Overview
Adds documentation to optimize/feedback.mdx for the new Feedback by page toggle in the feedback analytics tab, explaining how thumbs up/down votes are aggregated per page.

Describes the two resulting lists (Liked by viewers and Needs improvement), their sorting (net positive/negative), and how to use this view to prioritize documentation updates by overall page sentiment.

^{Written by Cursor Bugbot for commit ddc7cfb. This will update automatically on new commits. Configure here.}