/usr/lib/ghc-doc/hoogle/libghc-utf8-light-doc.txt is in libghc-utf8-light-doc 0.4.2-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-utf8-light-doc/html/utf8-light.txt