/usr/share/doc/ is in lua-socket-dev 3.0~rc1-3.
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/usr/share/doc/lua-socket-dev/
/usr/share/doc/lua-socket-dev/doc/
/usr/share/doc/lua-socket-dev/doc/udp.html
/usr/share/doc/lua-socket-dev/doc/url.html
/usr/share/doc/lua-socket-dev/doc/mime.html
/usr/share/doc/lua-socket-dev/doc/luasocket.png
/usr/share/doc/lua-socket-dev/doc/ftp.html
/usr/share/doc/lua-socket-dev/doc/reference.html
/usr/share/doc/lua-socket-dev/doc/http.html
/usr/share/doc/lua-socket-dev/doc/index.html
/usr/share/doc/lua-socket-dev/doc/smtp.html
/usr/share/doc/lua-socket-dev/doc/installation.html
/usr/share/doc/lua-socket-dev/doc/introduction.html
/usr/share/doc/lua-socket-dev/doc/tcp.html
/usr/share/doc/lua-socket-dev/doc/reference.css
/usr/share/doc/lua-socket-dev/doc/socket.html
/usr/share/doc/lua-socket-dev/doc/ltn12.html
/usr/share/doc/lua-socket-dev/doc/dns.html
/usr/share/doc/lua-socket-dev/changelog.Debian.gz
/usr/share/doc/lua-socket-dev/samples/
/usr/share/doc/lua-socket-dev/samples/mcsend.lua
/usr/share/doc/lua-socket-dev/samples/daytimeclnt.lua
/usr/share/doc/lua-socket-dev/samples/mclisten.lua
/usr/share/doc/lua-socket-dev/samples/README
/usr/share/doc/lua-socket-dev/samples/echoclnt.lua
/usr/share/doc/lua-socket-dev/samples/tinyirc.lua
/usr/share/doc/lua-socket-dev/samples/talker.lua
/usr/share/doc/lua-socket-dev/samples/listener.lua
/usr/share/doc/lua-socket-dev/samples/cddb.lua
/usr/share/doc/lua-socket-dev/samples/lpr.lua
/usr/share/doc/lua-socket-dev/samples/echosrvr.lua
/usr/share/doc/lua-socket-dev/copyright