/usr/share/doc/libgazebo7-dev/changelog.Debian.gz is in libgazebo7-dev 7.0.0+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgazebo7-dev/../libgazebo7/changelog.Debian.gz
/usr/share/doc/libgazebo7-dev/../libgazebo7/changelog.Debian.gz