docs: public Observable<Page<VirtualMachineScaleSetSkuInner>> listSkusAsync(final String resourceGroupName, final String vmScaleSetName) {
          return listSkusWithServiceResponseAsync(resourceGroupName, vmScaleSetName)
              .map(new Func1<ServiceResponse<Page<VirtualMachineScaleSetSkuInner>>, Page<VirtualMachineScaleSetSkuInner>>() {
                  @Override
                  public Page<VirtualMachineScaleSetSkuInner> call(ServiceResponse<Page<VirtualMachineScaleSetSkuInner>> response) {
                      return response.body();
                  }
              });
      }