/usr/lib/ghc-doc/hoogle/libghc-adjunctions-doc.txt is in libghc-adjunctions-doc 4.3-4build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-adjunctions-doc/html/adjunctions.txt