/usr/lib/ghc-doc/hoogle/libghc-heist-doc.txt is in libghc-heist-doc 0.14.1.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-heist-doc/html/heist.txt