NPA-5825: Fixing Schema and reference to new error response example

Author: ellie-bound1-NHSD

…POST_Consent/errors/invalid-request.yaml …POST_Consent/errors/invalid_request.yamlspecification/examples/responses/POST_Consent/errors/invalid-request.yaml renamed to specification/examples/responses/POST_Consent/errors/invalid_request.yaml specification/examples/responses/POST_Consent/errors/invalid-request.yaml renamed to specification/examples/responses/POST_Consent/errors/invalid_request.yaml

@@ -2280,7 +2280,10 @@ components:
         provision:
           $ref: "#/components/schemas/Provision"
         extension:
-          $ref: "#/components/schemas/Extension"
+          type: array
+          items:
+            $ref: "#/components/schemas/Extension"
+          description: "Reasons for the status of the consent"
 
     Policy:
       type: object