Exclude .codespell from Sphinx

[AA-Turner]

RE #2151; fixes Sphinx build.

A

[AA-Turner]

Good god I'm bad on getting things mixed up in PR titles -- first RST vs RFC, now codeowners vs codespell 😁

Thanks for merging Jelle

[CAM-Gerlach]

Happens to all of us 😆 Luckily I fixed it with a few seconds to spare :)

This is going to keep happening whenever anyone add .txt files to the repo, whether as config or as a PEP supplement. Is there any way we can specifically match only \.rst$|^/pep-[0-9]{4}\.txt$, or at least only .txt (but not.rst) in the root?

[AA-Turner]

Ideally I'd whitelist to include_patterns = ["pep-????"], but Sphinx doesn't support include_patterns. (Need to get a second to submit a feature request & implementation upstream)

The build on PRs going forwards will make it much easier to catch in the future, though.

A