The example release object used in the high-level API overview defines
spec.targetStep as 0 and status.achievedState as 2, whereas
status.strategy.state declares all 4 state attributes (installation,
traffic, capacity and command) as False, which indicates that the
release is complete. This might be misleading for a reader as this
release state is unstable and immediately provokes a chain of changes by
Shipper. Declaring targetStep as 2 makes more sense as this brings the
release to a "happy" complete state and the rest of the conditions and
state attributes make sense.
This is a cherry-pick for #311