/usr/share/doc/libgdbm-compat4/changelog.Debian.gz is in libgdbm-compat4 1.14.1-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgdbm-compat4/../libgdbm5/changelog.Debian.gz
/usr/share/doc/libgdbm-compat4/../libgdbm5/changelog.Debian.gz