/usr/lib/ghc-doc/hoogle/libghc-crypto-numbers-doc.txt is in libghc-crypto-numbers-doc 0.2.7-7build7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-crypto-numbers-doc/html/crypto-numbers.txt