/usr/share/doc/libdbd-pg-ruby/changelog.Debian.gz is in libdbd-pg-ruby 0.3.9+gem2deb-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdbd-pg-ruby/../ruby-dbd-pg/changelog.Debian.gz
/usr/share/doc/libdbd-pg-ruby/../ruby-dbd-pg/changelog.Debian.gz