/usr/share/gtk-doc/ is in libaccounts-glib-doc 1.21+16.04.20160222-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/
/usr/share/gtk-doc/html/libaccounts-glib/
/usr/share/gtk-doc/html/libaccounts-glib/AgAccount.html
/usr/share/gtk-doc/html/libaccounts-glib/AgAccountService.html
/usr/share/gtk-doc/html/libaccounts-glib/AgApplication.html
/usr/share/gtk-doc/html/libaccounts-glib/AgAuthData.html
/usr/share/gtk-doc/html/libaccounts-glib/AgManager.html
/usr/share/gtk-doc/html/libaccounts-glib/AgProvider.html
/usr/share/gtk-doc/html/libaccounts-glib/AgService.html
/usr/share/gtk-doc/html/libaccounts-glib/AgServiceType.html
/usr/share/gtk-doc/html/libaccounts-glib/account-management.html
/usr/share/gtk-doc/html/libaccounts-glib/ag-backup.html
/usr/share/gtk-doc/html/libaccounts-glib/ag-tool.html
/usr/share/gtk-doc/html/libaccounts-glib/annotation-glossary.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-1-1.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-1-2.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-1-4.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-1-5.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-deprecated.html
/usr/share/gtk-doc/html/libaccounts-glib/api-index-full.html
/usr/share/gtk-doc/html/libaccounts-glib/appendices.html
/usr/share/gtk-doc/html/libaccounts-glib/gettext-xml-files.html
/usr/share/gtk-doc/html/libaccounts-glib/glossary.html
/usr/share/gtk-doc/html/libaccounts-glib/home.png
/usr/share/gtk-doc/html/libaccounts-glib/index.html
/usr/share/gtk-doc/html/libaccounts-glib/index.sgml
/usr/share/gtk-doc/html/libaccounts-glib/left-insensitive.png
/usr/share/gtk-doc/html/libaccounts-glib/left.png
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-compiling.html
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-glib-objects.html
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-glib-overview.html
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-glib-tools.html
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-glib.devhelp2
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-overview.html
/usr/share/gtk-doc/html/libaccounts-glib/libaccounts-running.html
/usr/share/gtk-doc/html/libaccounts-glib/object-tree.html
/usr/share/gtk-doc/html/libaccounts-glib/provider-file-format.html
/usr/share/gtk-doc/html/libaccounts-glib/right-insensitive.png
/usr/share/gtk-doc/html/libaccounts-glib/right.png
/usr/share/gtk-doc/html/libaccounts-glib/service-file-format.html
/usr/share/gtk-doc/html/libaccounts-glib/service-type-file-format.html
/usr/share/gtk-doc/html/libaccounts-glib/style.css
/usr/share/gtk-doc/html/libaccounts-glib/up-insensitive.png
/usr/share/gtk-doc/html/libaccounts-glib/up.png
/usr/share/gtk-doc/html/libaccounts-glib/validating-xml-files.html
/usr/share/gtk-doc/html/libaccounts-glib/xml-file-formats.html
/usr/share/gtk-doc/html/libaccounts-glib/xml-files.html