/usr/share/gtk-doc/ is in libgpod-doc 0.8.3-4ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libgpod/
/usr/share/gtk-doc/html/libgpod/ch01.html
/usr/share/gtk-doc/html/libgpod/home.png
/usr/share/gtk-doc/html/libgpod/index.html
/usr/share/gtk-doc/html/libgpod/index.sgml
/usr/share/gtk-doc/html/libgpod/itunesdb.html
/usr/share/gtk-doc/html/libgpod/left.png
/usr/share/gtk-doc/html/libgpod/libgpod-Artwork.html
/usr/share/gtk-doc/html/libgpod/libgpod-Chapter-Data.html
/usr/share/gtk-doc/html/libgpod/libgpod-Device.html
/usr/share/gtk-doc/html/libgpod/libgpod-File-handling-functions.html
/usr/share/gtk-doc/html/libgpod/libgpod-Low-level-functions.html
/usr/share/gtk-doc/html/libgpod/libgpod-Photo-database.html
/usr/share/gtk-doc/html/libgpod/libgpod-Playlists.html
/usr/share/gtk-doc/html/libgpod/libgpod-Smart-Playlists.html
/usr/share/gtk-doc/html/libgpod/libgpod-The-Itdb-iTunesDB-structure.html
/usr/share/gtk-doc/html/libgpod/libgpod-Time-handling.html
/usr/share/gtk-doc/html/libgpod/libgpod-Tracks.html
/usr/share/gtk-doc/html/libgpod/libgpod.devhelp2
/usr/share/gtk-doc/html/libgpod/photodb.html
/usr/share/gtk-doc/html/libgpod/right.png
/usr/share/gtk-doc/html/libgpod/style.css
/usr/share/gtk-doc/html/libgpod/up.png