/usr/lib/ghc-doc/hoogle/io-choice.txt is in libghc-io-choice-doc 0.0.5-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-io-choice-doc/html/io-choice.txt