/usr/share/doc/libaddressable-ruby1.9.1/changelog.Debian.gz is in libaddressable-ruby1.9.1 2.2.6-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libaddressable-ruby1.9.1/../ruby-addressable/changelog.Debian.gz