/usr/share/doc/ is in iptables-dev 1.6.0-2ubuntu3.
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/usr/share/doc-base/netfilter-extensions
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/usr/share/doc/iptables-dev/html/netfilter-extensions-HOWTO.html
/usr/share/doc/iptables-dev/html/netfilter-hacking-HOWTO-2.html
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/usr/share/doc/iptables-dev/html/netfilter-hacking-HOWTO-7.html
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/usr/share/doc/iptables-dev/html/netfilter-extensions-HOWTO-3.html
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/usr/share/doc/iptables-dev/html/netfilter-hacking-HOWTO.html
/usr/share/doc/iptables-dev/html/netfilter-extensions-HOWTO-5.html
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/usr/share/doc/iptables-dev/html/netfilter-extensions-HOWTO-1.html
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