guix: Update documentation for time-machine
guix: Update documentation for time-machine

Wait a minute, doc. Are you telling me you built a time machine... Out
of a functional package manager?


Former-commit-id: 113d0ac6a104351061053ca33bf00733673bb3dd
syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2