/usr/lib/ghc-doc/hoogle/SDL.txt is in libghc-sdl-doc 0.6.4-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-sdl-doc/html/SDL.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-sdl-doc/html/SDL.txt