/usr/lib/ghc-doc/hoogle/MonadRandom.txt is in libghc-monadrandom-doc 0.1.6-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-monadrandom-doc/html/MonadRandom.txt