/usr/lib/ghc-doc/hoogle/libghc-numbers-doc.txt is in libghc-numbers-doc 3000.2.0.1-6build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-numbers-doc/html/numbers.txt