/usr/lib/ghc-doc/hoogle/libghc-io-choice-doc.txt is in libghc-io-choice-doc 0.0.6-3build6.
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