/usr/share/doc/libmaruku-ruby/changelog.Debian.gz is in libmaruku-ruby 0.6.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmaruku-ruby/../ruby-maruku/changelog.Debian.gz
/usr/share/doc/libmaruku-ruby/../ruby-maruku/changelog.Debian.gz