Existing Wording: "patientInstruction" : "<string>", // Patient or consumer-oriented instructions

Comment:

Need to provide ability to include specific instruction material that can reference any resource. For example, service request is to provide diabetic education. patient instruction about the diabetic diet may be instructions on the nutrition order about the diabetic diet. In this case, will need to be able to reference nutrition order. Diabetic diet instructions may be educational material which could be DocumentReference.

Summary:

Add support for instructional material