/usr/share/man/man8/ip6tables-restore.8.gz is in iptables 1.6.0+snapshot20161117-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man8/iptables-restore.8.gz
/usr/share/man/man8/iptables-restore.8.gz