/usr/lib/ghc-doc/hoogle/libghc-skein-doc.txt is in libghc-skein-doc 1.0.9.4-3build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-skein-doc/html/skein.txt