/usr/lib/ghc-doc/hoogle/nats.txt is in libghc-nats-doc 0.1.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-nats-doc/html/nats.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-nats-doc/html/nats.txt