code: public Observable<SignalRResourceInner> beginUpdateAsync(String resourceGroupName, String resourceName) {
          return beginUpdateWithServiceResponseAsync(resourceGroupName, resourceName).map(new Func1<ServiceResponse<SignalRResourceInner>, SignalRResourceInner>() {
              @Override
              public SignalRResourceInner call(ServiceResponse<SignalRResourceInner> response) {
                  return response.body();
              }
          });
      }
docs: Operation to update an exiting SignalR service.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param resourceName The name of the SignalR resource.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the SignalRResourceInner object