docs: public Observable<Page<GalleryImageInner>> listAsync(final String resourceGroupName, final String labAccountName) {
          return listWithServiceResponseAsync(resourceGroupName, labAccountName)
              .map(new Func1<ServiceResponse<Page<GalleryImageInner>>, Page<GalleryImageInner>>() {
                  @Override
                  public Page<GalleryImageInner> call(ServiceResponse<Page<GalleryImageInner>> response) {
                      return response.body();
                  }
              });
      }