/usr/share/doc/ is in iptables 1.6.0-2ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc-base/nat
/usr/share/doc-base/packet-filter
/usr/share/doc/iptables/
/usr/share/doc/iptables/html/
/usr/share/doc/iptables/html/NAT-HOWTO-7.html
/usr/share/doc/iptables/html/NAT-HOWTO-5.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-8.html
/usr/share/doc/iptables/html/NAT-HOWTO-3.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-1.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-10.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-2.html
/usr/share/doc/iptables/html/NAT-HOWTO.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-9.html
/usr/share/doc/iptables/html/NAT-HOWTO-9.html
/usr/share/doc/iptables/html/NAT-HOWTO-1.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-7.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-6.html
/usr/share/doc/iptables/html/NAT-HOWTO-6.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-5.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-3.html
/usr/share/doc/iptables/html/NAT-HOWTO-8.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO.html
/usr/share/doc/iptables/html/NAT-HOWTO-4.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-11.html
/usr/share/doc/iptables/html/packet-filtering-HOWTO-4.html
/usr/share/doc/iptables/html/NAT-HOWTO-2.html
/usr/share/doc/iptables/html/NAT-HOWTO-11.html
/usr/share/doc/iptables/html/NAT-HOWTO-10.html
/usr/share/doc/iptables/copyright
/usr/share/doc/iptables/README.Debian
/usr/share/doc/iptables/INCOMPATIBILITIES
/usr/share/doc/iptables/changelog.Debian.gz