Fix vertical alignment of definition terms


The vertical alignment of "Editors" inside its box is a bit off, it's too high up: https://docs.python.org/3/whatsnew/3.14.html

<img width="388" height="108" alt="Image" src="https://github.com/user-attachments/assets/fb6ac730-2677-4803-abc3-ed7b4e28af8e" />

This is a `<dl><dt>Editors</dt><dd>...</dd>` structure.

We should also check other uses of this HTML in the docs.