/usr/lib/ghc-doc/hoogle/harp.txt is in libghc-harp-doc 0.4-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-harp-doc/html/harp.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-harp-doc/html/harp.txt