Spec states "deltaHash" but all test vectors use "delta"

[decentralgabe]

Spec text -- https://identity.foundation/sidetree/spec/#create

See test vectors -- https://identity.foundation/sidetree/spec/#update-2

[decentralgabe]

I see this is because the long form DID contains two objects, one called delta which refers to the create operation delta object, and another suffixData referring to the create operation suffix data object which itself contains a deltaHash property.

Text should be added to the long form DID section that calls out this data model explicitly instead of relying on examples.