/usr/lib/ghc-doc/hoogle/libghc-readline-doc.txt is in libghc-readline-doc 1.0.3.0-7build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-readline-doc/html/readline.txt