There's a merged pull request on the void-packages repository

python3-Sphinx: update to 2.3.1, afew add Python 3.8 patch
https://github.com/void-linux/void-packages/pull/17833

Description:
- split out from python-Sphinx (2.x.x doesn't support python 2)
- despite their license looks like BSD-2-Clause, their README says it's a BSD-3-Clause
- python3-Sphinx doesn't depends on python3-setuptools (checked the code)
- afew docs couldn't be built with old Sphinx