/usr/share/doc/ is in xfce4-session 4.8.3-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/xfce4-session/
/usr/share/doc/xfce4-session/html/
/usr/share/doc/xfce4-session/html/el/
/usr/share/doc/xfce4-session/html/el/images/
/usr/share/doc/xfce4-session/html/el/images/xfsm-splash.png
/usr/share/doc/xfce4-session/html/el/images/xfsm-general.png
/usr/share/doc/xfce4-session/html/el/images/xfsm-advanced.png
/usr/share/doc/xfce4-session/html/el/index.html
/usr/share/doc/xfce4-session/html/C/
/usr/share/doc/xfce4-session/html/C/images/
/usr/share/doc/xfce4-session/html/C/images/xfsm-splash.png
/usr/share/doc/xfce4-session/html/C/images/xfsm-general.png
/usr/share/doc/xfce4-session/html/C/images/xfsm-advanced.png
/usr/share/doc/xfce4-session/html/C/index.html
/usr/share/doc/xfce4-session/html/xfce4-session.css
/usr/share/doc/xfce4-session/html/da/
/usr/share/doc/xfce4-session/html/da/index.html
/usr/share/doc/xfce4-session/html/gl/
/usr/share/doc/xfce4-session/html/gl/index.html
/usr/share/doc/xfce4-session/html/hr/
/usr/share/doc/xfce4-session/html/hr/index.html
/usr/share/doc/xfce4-session/html/it/
/usr/share/doc/xfce4-session/html/it/index.html
/usr/share/doc/xfce4-session/html/ja/
/usr/share/doc/xfce4-session/html/ja/index.html
/usr/share/doc/xfce4-session/html/pt_BR/
/usr/share/doc/xfce4-session/html/pt_BR/index.html
/usr/share/doc/xfce4-session/html/ru/
/usr/share/doc/xfce4-session/html/ru/index.html
/usr/share/doc/xfce4-session/html/sv/
/usr/share/doc/xfce4-session/html/sv/index.html
/usr/share/doc/xfce4-session/html/tr/
/usr/share/doc/xfce4-session/html/tr/index.html
/usr/share/doc/xfce4-session/html/ug/
/usr/share/doc/xfce4-session/html/ug/index.html
/usr/share/doc/xfce4-session/html/zh_CN/
/usr/share/doc/xfce4-session/html/zh_CN/index.html
/usr/share/doc/xfce4-session/BUGS
/usr/share/doc/xfce4-session/README
/usr/share/doc/xfce4-session/TODO
/usr/share/doc/xfce4-session/README.Kiosk
/usr/share/doc/xfce4-session/FAQ
/usr/share/doc/xfce4-session/README.Debian
/usr/share/doc/xfce4-session/copyright
/usr/share/doc/xfce4-session/NEWS.gz
/usr/share/doc/xfce4-session/changelog.Debian.gz
/usr/share/doc/xfce4-session/html/da/images
/usr/share/doc/xfce4-session/html/gl/images
/usr/share/doc/xfce4-session/html/hr/images
/usr/share/doc/xfce4-session/html/it/images
/usr/share/doc/xfce4-session/html/ja/images
/usr/share/doc/xfce4-session/html/pt_BR/images
/usr/share/doc/xfce4-session/html/ru/images
/usr/share/doc/xfce4-session/html/sv/images
/usr/share/doc/xfce4-session/html/tr/images
/usr/share/doc/xfce4-session/html/ug/images
/usr/share/doc/xfce4-session/html/zh_CN/images