/usr/lib/ghc-doc/hoogle/libghc-snap-server-doc.txt is in libghc-snap-server-doc 0.9.5.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-snap-server-doc/html/snap-server.txt