Same as on EPEL7, the packages conflict: file /usr/share/man/man7/mdoc.7.gz from install of mandoc-1.14.5-12.el8.x86_64 conflicts with file from package man-pages-4.15-6.el8.x86_64
I've got an update for this coming in a few minutes.
FEDORA-EPEL-2021-51a50bd8ba has been submitted as an update to Fedora EPEL 8. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-51a50bd8ba
FEDORA-EPEL-2021-51a50bd8ba has been pushed to the Fedora EPEL 8 testing repository. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-51a50bd8ba See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-EPEL-2021-51a50bd8ba has been pushed to the Fedora EPEL 8 stable repository. If problem still persists, please make note of it in this bug report.