code: public ServiceFuture<WorkflowInner> updateAsync(String resourceGroupName, String workflowName, WorkflowInner workflow, final ServiceCallback<WorkflowInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(resourceGroupName, workflowName, workflow), serviceCallback);
      }
docs: Updates a workflow.
  
  @param resourceGroupName The resource group name.
  @param workflowName The workflow name.
  @param workflow The workflow.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object