/usr/share/gtk-doc/html/ is in libgnome-desktop-dev 1:2.32.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/gnome-desktop/
/usr/share/gtk-doc/html/gnome-desktop/GnomeBG.html
/usr/share/gtk-doc/html/gnome-desktop/GnomeDesktopThumbnailFactory.html
/usr/share/gtk-doc/html/gnome-desktop/GnomeRRLabeler.html
/usr/share/gtk-doc/html/gnome-desktop/background.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-GnomeDesktopItem.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-Miscellaneous-Functions.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-Miscellaneous-Thumbnail-Functions.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-gnome-rr-config.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-gnome-rr-crtc.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-gnome-rr-mode.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-gnome-rr-output.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop-gnome-rr-screen.html
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop.devhelp
/usr/share/gtk-doc/html/gnome-desktop/gnome-desktop.devhelp2
/usr/share/gtk-doc/html/gnome-desktop/home.png
/usr/share/gtk-doc/html/gnome-desktop/index.html
/usr/share/gtk-doc/html/gnome-desktop/index.sgml
/usr/share/gtk-doc/html/gnome-desktop/intro.html
/usr/share/gtk-doc/html/gnome-desktop/left.png
/usr/share/gtk-doc/html/gnome-desktop/libgnome.html
/usr/share/gtk-doc/html/gnome-desktop/randr.html
/usr/share/gtk-doc/html/gnome-desktop/right.png
/usr/share/gtk-doc/html/gnome-desktop/style.css
/usr/share/gtk-doc/html/gnome-desktop/thumbnail.html
/usr/share/gtk-doc/html/gnome-desktop/up.png