footnote in cabal manual is misformatted

**What is wrong with the docs?**
https://cabal.readthedocs.io/en/stable/cabal-package-description-file.html#old-style-build-tool-depends is formatted rather strangely in my browser.

**Additional context**

<img width="2556" height="1416" alt="Image" src="https://github.com/user-attachments/assets/15ae8c8b-e22a-436d-a9d5-65b50fd7fa70" />
Chrome Version 141.0.7390.54 (Official Build) (64-bit) Linux
