gh-89083: small docs fixup for UUIDv8

[picnixz]

• Issue: Support UUIDv6, UUIDv7, and UUIDv8 from RFC 9562 #89083

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📚 Documentation preview 📚: https://cpython-previews--126857.org.readthedocs.build/

[hugovk]

Thanks!

[picnixz]

Oh, I actually used a versionadded. It does not really matter here but semantically speaking, maybe a versionchanged would have been better? I used that directive in the v6 and v8 PRs but let's not change it in a follow-up commit (it's not really an issue).

[hugovk]

In that we're adding uuid8() and changing the CLI to support version 8?

We could also say we're adding uuid8() and adding version 8 to the CLI. I don't mind too much either way :)

[picnixz]

In that we're adding uuid8() and changing the CLI to support version 8?

Yes. In addition, our convention seems to the "changed in version XXX" when we add new parameters or if there's already a versionadded for the object being documented (in this case the CLI program).