Example 46 should return an UnknownOrderError

[nickevansuk]

There's an error in Example 46. It should return an UnknownOrderError, as follows:

EXAMPLE 46: Order Deletion: example Order not found response
HTTP/1.1 404 Not Found
Date: Mon, 8 Oct 2018 20:52:36 GMT
Content-Type: application/vnd.openactive.booking+json; version=1

{
  "@context": "https://openactive.io/",
  "@type": "UnknownOrderError",
  "description": "This Order does not exist."
}