docs: public Observable<Void> resendEmailAsync(String resourceGroupName, String certificateOrderName) {
          return resendEmailWithServiceResponseAsync(resourceGroupName, certificateOrderName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }