/usr/share/doc/libwnckmm-1.0-0-dev/changelog.Debian.gz is in libwnckmm-1.0-0-dev 0.1.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libwnckmm-1.0-0-dev/../libwnckmm-1.0-0/changelog.Debian.gz