message: Update account.json - make CollectionReferece type writable
  * Update account.json
  Updating the CollectionReference to be writeable to unblock the customers.
  * Update account.json
  Need the default set in the client SDK
diff: "type": {
  "description": "Gets the reference type property.",
  "type": "string",
  - "readOnly": true
  + "x-ms-client-default": "CollectionReference"
  }
  }
  },
  