/usr/share/doc/libkohana3.1-mod-image-php/changelog.Debian.gz is in libkohana3.1-mod-image-php 3.1.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libkohana3.1-mod-image-php/../libkohana3.1-core-php/changelog.Debian.gz