NPA-5357: Revert POST /QuestionnaireResponse to use ReferenceCode

Author: lelliott-hippo

specification/examples/responses/POST_QuestionnaireResponse/success.yaml

@@ -1,12 +1,12 @@
 PostQuestionnaireResponseSuccess:
   summary: Success
-  description: A sample of the payload returned when a QuestionnaireResponse (proxy access request) has been successfully submitted. It contains the unique id of the access request.
+  description: A sample of the payload returned when a QuestionnaireResponse (proxy access request) has been successfully submitted. It contains a unique alpha-numeric reference code to identify the request by.
   value:
     resourceType: "OperationOutcome"
     issue:
       - severity: information
         code: informational
         details:
           coding:
-            - code: "156e1560-e532-4e2a-85ad-5aeff03dc43e"
-              display: "156e1560-e532-4e2a-85ad-5aeff03dc43e"
+            - code: "19318ZGLAB"
+              display: "19318ZGLAB"