/usr/lib/ghc-doc/hoogle/libghc-fixed-doc.txt is in libghc-fixed-doc 0.2.1.1-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-fixed-doc/html/fixed.txt