/usr/share/gtk-doc/html/phat/phat.devhelp is in libphat-tools 0.4.1-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gtk-doc/html/phat/../../../libphat-dev/html/phat/phat.devhelp
/usr/share/gtk-doc/html/phat/../../../libphat-dev/html/phat/phat.devhelp