/usr/share/doc/libdianewcanvas2-dev/changelog.Debian.gz is in libdianewcanvas2-dev 0.6.10-5.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdianewcanvas2-dev/../libdianewcanvas2/changelog.Debian.gz