/usr/lib/ghc-doc/hoogle/libghc-syb-doc.txt is in libghc-syb-doc 0.6-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-syb-doc/html/syb.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-syb-doc/html/syb.txt