/usr/lib/ghc-doc/hoogle/cprng-aes.txt is in libghc-cprng-aes-doc 0.5.2-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-cprng-aes-doc/html/cprng-aes.txt