/usr/lib/ghc-doc/hoogle/sfml-audio.txt is in libghc-sfml-audio-doc 0.7.0.1816-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-sfml-audio-doc/html/sfml-audio.txt