/usr/share/doc/ocaml-findlib/changelog.Debian.gz is in ocaml-findlib 1.4-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ocaml-findlib/../libfindlib-ocaml/changelog.Debian.gz
/usr/share/doc/ocaml-findlib/../libfindlib-ocaml/changelog.Debian.gz