/usr/lib/ghc-doc/hoogle/zlib-bindings.txt is in libghc-zlib-bindings-doc 0.1.1.1-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-zlib-bindings-doc/html/zlib-bindings.txt