/usr/lib/ghc-doc/hoogle/libghc-zeromq4-haskell-doc.txt is in libghc-zeromq4-haskell-doc 0.6.4-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-zeromq4-haskell-doc/html/zeromq4-haskell.txt