/usr/share/doc/libcoq-ocaml-dev/NEWS.Debian.gz is in libcoq-ocaml-dev 8.4pl3dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcoq-ocaml-dev/../coq/NEWS.Debian.gz
/usr/share/doc/libcoq-ocaml-dev/../coq/NEWS.Debian.gz