/usr/lib/ghc-doc/hoogle/taffybar.txt is in libghc-taffybar-doc 0.2.1-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-taffybar-doc/html/taffybar.txt