doc: update SVC state machine with latest changes

In fbcd7d2 and 96257cc the state machine transitions were changed to
ensure that pre:scripts only run when conditions have been asserted, and
that manual:yes run/tasks end properly in 'DONE' as their siblilngs.

Also include SVG in repo for reference since that's the best export from
the original at draw.io

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

doc/svc-machine.svg

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