/usr/share/doc/golang-yaml.v2-dev/changelog.Debian.gz is in golang-yaml.v2-dev 0.0+git20170407.0.cd8b52f-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/golang-yaml.v2-dev/../golang-gopkg-yaml.v2-dev/changelog.Debian.gz