Wiring diagram, Z motors

[kelliead]

Current wiring diagram for Duet 2 doesn't match what the current motor kit actually comes with. The out-of-the-box order of the wires on the premade harnesses work correctly, update the diagram to match.

Pictures of up-to-date Z motor connectors:

[kelliead]

When making improved wiring documentation, add a reminder to set the PSU to the correct regional voltage