/usr/lib/ghc-doc/hoogle/libghc-hxt-curl-doc.txt is in libghc-hxt-curl-doc 9.1.1.1-4build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hxt-curl-doc/html/hxt-curl.txt