/usr/share/gtk-doc/html/umockdev is in libumockdev-dev 0.8.8-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gtk-doc/html/../../doc/libumockdev-dev/html/umockdev
/usr/share/gtk-doc/html/../../doc/libumockdev-dev/html/umockdev