/usr/share/gtk-doc/html/polkit-1 is in policykit-1-doc 0.104-1ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gtk-doc/html/../../doc/policykit-1-doc/html
/usr/share/gtk-doc/html/../../doc/policykit-1-doc/html