Summary

https://matplotlib.org/stable/users/prev_whats_new/whats_new_3.10.0.html is missing a heading

What's new in Matplotlib 3.10.0 (Dec xx, 2024)

This causes the individial headings to pop up in

https://matplotlib.org/stable/users/release_notes

Proposed fix

1. Fix the release notes.
2. Merge up to main - this has also not been done for the 3.10 release.