docs: public Observable<Page<ActivityInner>> listByModuleNextAsync(final String nextPageLink) {
          return listByModuleNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<ActivityInner>>, Page<ActivityInner>>() {
                  @Override
                  public Page<ActivityInner> call(ServiceResponse<Page<ActivityInner>> response) {
                      return response.body();
                  }
              });
      }