/usr/share/gtk-doc/ is in libwnck-doc 1:2.30.7-5ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libwnck/
/usr/share/gtk-doc/html/libwnck/WnckApplication.html
/usr/share/gtk-doc/html/libwnck/WnckClassGroup.html
/usr/share/gtk-doc/html/libwnck/WnckPager.html
/usr/share/gtk-doc/html/libwnck/WnckScreen.html
/usr/share/gtk-doc/html/libwnck/WnckSelector.html
/usr/share/gtk-doc/html/libwnck/WnckTasklist.html
/usr/share/gtk-doc/html/libwnck/WnckWindow.html
/usr/share/gtk-doc/html/libwnck/WnckWorkspace.html
/usr/share/gtk-doc/html/libwnck/core.html
/usr/share/gtk-doc/html/libwnck/home.png
/usr/share/gtk-doc/html/libwnck/index.html
/usr/share/gtk-doc/html/libwnck/index.sgml
/usr/share/gtk-doc/html/libwnck/indexes.html
/usr/share/gtk-doc/html/libwnck/intro.html
/usr/share/gtk-doc/html/libwnck/ix01.html
/usr/share/gtk-doc/html/libwnck/ix02.html
/usr/share/gtk-doc/html/libwnck/ix03.html
/usr/share/gtk-doc/html/libwnck/ix04.html
/usr/share/gtk-doc/html/libwnck/ix05.html
/usr/share/gtk-doc/html/libwnck/ix06.html
/usr/share/gtk-doc/html/libwnck/ix07.html
/usr/share/gtk-doc/html/libwnck/ix08.html
/usr/share/gtk-doc/html/libwnck/ix09.html
/usr/share/gtk-doc/html/libwnck/ix10.html
/usr/share/gtk-doc/html/libwnck/ix11.html
/usr/share/gtk-doc/html/libwnck/ix12.html
/usr/share/gtk-doc/html/libwnck/left.png
/usr/share/gtk-doc/html/libwnck/libwnck-Miscellaneous-Functions.html
/usr/share/gtk-doc/html/libwnck/libwnck-Resource-Usage-of-X-Clients.html
/usr/share/gtk-doc/html/libwnck/libwnck-Window-Action-Menu.html
/usr/share/gtk-doc/html/libwnck/libwnck.devhelp
/usr/share/gtk-doc/html/libwnck/libwnck.devhelp2
/usr/share/gtk-doc/html/libwnck/right.png
/usr/share/gtk-doc/html/libwnck/style.css
/usr/share/gtk-doc/html/libwnck/up.png
/usr/share/gtk-doc/html/libwnck/utils.html
/usr/share/gtk-doc/html/libwnck/widgets.html