/usr/lib/ghc-doc/hoogle/dpkg.txt is in libghc-dpkg-doc 0.0.3-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-dpkg-doc/html/dpkg.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-dpkg-doc/html/dpkg.txt