/usr/lib/ghc-doc/hoogle/yi.txt is in libghc-yi-doc 0.7.0-1build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-yi-doc/html/yi.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-yi-doc/html/yi.txt