/usr/share/doc/gir1.2-glib-2.0/changelog.Debian.gz is in gir1.2-glib-2.0 1.40.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-glib-2.0/../libgirepository-1.0-1/changelog.Debian.gz