/usr/lib/ghc-doc/hoogle/libghc-werewolf-doc.txt is in libghc-werewolf-doc 1.5.1.1-8build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-werewolf-doc/html/werewolf.txt