/usr/lib/ghc-doc/hoogle/libghc-monad-par-doc.txt is in libghc-monad-par-doc 0.3.4.8-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-monad-par-doc/html/monad-par.txt