/usr/share/doc/libdesktop-agnostic-fdo-glib/changelog.Debian.gz is in libdesktop-agnostic-fdo-glib 0.3.92+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdesktop-agnostic-fdo-glib/../libdesktop-agnostic-data/changelog.Debian.gz