/usr/share/man/man8/nis_selinux.8.gz is in selinux-policy-doc 2:2.20180114-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man8/ypbind_selinux.8.gz
/usr/share/man/man8/ypbind_selinux.8.gz