I've just pushed and built python-sphinx-2.1.2-1.fc31 for rawhide.
I don't anticipate any breakage. In case unexpected breakage happens, let me know.
https://src.fedoraproject.org/rpms/python-sphinx/pull-request/12 https://bugzilla.redhat.com/show_bug.cgi?id=1716158
Thanks,
python-devel@lists.fedoraproject.org