/usr/lib/ghc-doc/hoogle/libghc-authenticate-doc.txt is in libghc-authenticate-doc 1.3.2.11-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-authenticate-doc/html/authenticate.txt