/usr/lib/ghc-doc/hoogle/libghc-hookup-doc.txt is in libghc-hookup-doc 0.1.0.0-4build6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hookup-doc/html/hookup.txt