/usr/lib/ghc-doc/hoogle/explicit-exception.txt is in libghc-explicit-exception-doc 0.1.7.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-explicit-exception-doc/html/explicit-exception.txt