Clarify what property names are used in @JsonbPropertyOrder

If I have a JSON-B data class like this:

```java
@JsonbPropertyOrder({"????"})
public class JsonbObject {

@JsonbProperty("identity")
long id;
@JsonbProperty("desc")
String description;
@JsonbProperty("thecost")
double cost;
@JsonbProperty("tstamp")
Date timeStamp;
```

From reading the spec, it is not clear if the String array passed into `@JsonbPropertyOrder` should be the original name of the java properties (`id, description, cost, timeStamp`) or the final JSON-B property names (`identity, desc, thecost, tstamp`).

I am not sure what the original intent of the spec was, but I think that using the final JSON-B property names (`identity, desc, thecost, tstamp`) makes the most sense.

Read the @JsonbPropertyOrder and @JsonbProperty annotation definitions and their specification text first. Determine whether ordering uses Java property names or serialized JSON-B names, then clarify the specification so the accepted property-name form and the example are unambiguous.

Written by the indexing model from the issue text.