/usr/share/doc/linux-cloud-tools-4.13.0-1006-azure/changelog.Debian.gz is in linux-cloud-tools-4.13.0-1006-azure 4.13.0-1006.8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-4.13.0-1006-azure/../linux-azure-cloud-tools-4.13.0-1006/changelog.Debian.gz