/usr/lib/ghc-doc/hoogle/debian.txt is in libghc-debian-doc 3.79.2-1build5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-debian-doc/html/debian.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-debian-doc/html/debian.txt