/usr/share/gtk-doc/ is in libglade2-dev 1:2.6.4-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libglade/
/usr/share/gtk-doc/html/libglade/GladeXML.html
/usr/share/gtk-doc/html/libglade/home.png
/usr/share/gtk-doc/html/libglade/index.html
/usr/share/gtk-doc/html/libglade/index.sgml
/usr/share/gtk-doc/html/libglade/left.png
/usr/share/gtk-doc/html/libglade/libglade-Libglade-Build.html
/usr/share/gtk-doc/html/libglade/libglade-Libglade-Initialisation.html
/usr/share/gtk-doc/html/libglade/libglade-Libglade-SAX-Parser.html
/usr/share/gtk-doc/html/libglade/libglade-dtd-exceptions.html
/usr/share/gtk-doc/html/libglade/libglade-dtd.html
/usr/share/gtk-doc/html/libglade/libglade-embedding.html
/usr/share/gtk-doc/html/libglade/libglade-extending.html
/usr/share/gtk-doc/html/libglade/libglade-i18n.html
/usr/share/gtk-doc/html/libglade/libglade-lib.html
/usr/share/gtk-doc/html/libglade/libglade-modules.html
/usr/share/gtk-doc/html/libglade/libglade-notes.html
/usr/share/gtk-doc/html/libglade/libglade.devhelp
/usr/share/gtk-doc/html/libglade/libglade.devhelp2
/usr/share/gtk-doc/html/libglade/right.png
/usr/share/gtk-doc/html/libglade/style.css
/usr/share/gtk-doc/html/libglade/up.png