/usr/share/lua/5.1/luadoc/ is in lua-doc 3.0.1+gitdb9e868-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/lua/5.1/luadoc/config.lua
/usr/share/lua/5.1/luadoc/doclet/
/usr/share/lua/5.1/luadoc/doclet/debug.lua
/usr/share/lua/5.1/luadoc/doclet/formatter.lua
/usr/share/lua/5.1/luadoc/doclet/html/
/usr/share/lua/5.1/luadoc/doclet/html.lua
/usr/share/lua/5.1/luadoc/doclet/html/file.lp
/usr/share/lua/5.1/luadoc/doclet/html/function.lp
/usr/share/lua/5.1/luadoc/doclet/html/index.lp
/usr/share/lua/5.1/luadoc/doclet/html/luadoc.css
/usr/share/lua/5.1/luadoc/doclet/html/menu.lp
/usr/share/lua/5.1/luadoc/doclet/html/module.lp
/usr/share/lua/5.1/luadoc/doclet/html/table.lp
/usr/share/lua/5.1/luadoc/doclet/raw.lua
/usr/share/lua/5.1/luadoc/init.lua
/usr/share/lua/5.1/luadoc/lp.lua
/usr/share/lua/5.1/luadoc/taglet/
/usr/share/lua/5.1/luadoc/taglet/standard/
/usr/share/lua/5.1/luadoc/taglet/standard.lua
/usr/share/lua/5.1/luadoc/taglet/standard/tags.lua
/usr/share/lua/5.1/luadoc/util.lua