Provide a succinct overview of the order life cycle so a user documentation writer can take it and turn it into user documentation on topics like:
- Orders and order statuses
- Payments and payment statuses
- Shipments and shipment statuses
- Workflows (buyer, seller)
...and how they all intersect to create the order life cycle.
Doc should cover the statuses and logic provided by the default order engine implementation that we will ship with Commerce 2.1.x.