/usr/share/doc/gir1.2-rest-0.7/changelog.Debian.gz is in gir1.2-rest-0.7 0.7.90-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-rest-0.7/../librest-0.7-0/changelog.Debian.gz