/usr/lib/ghc-doc/hoogle/libghc-memoize-doc.txt is in libghc-memoize-doc 0.7-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-memoize-doc/html/memoize.txt