/usr/lib/ghc-doc/hoogle/text-icu.txt is in libghc-text-icu-doc 0.6.3.7-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-text-icu-doc/html/text-icu.txt