def unpublish_iteration(project_id, iteration_id, custom_headers:nil)
      response = unpublish_iteration_async(project_id, iteration_id, custom_headers:custom_headers).value!
      nil
    end
def unpublish_iteration(project_id, iteration_id, custom_headers:nil)
      response = unpublish_iteration_async(project_id, iteration_id, custom_headers:custom_headers).value!
      nil
    end
Unpublish a specific iteration.

 @param project_id The project id.
 @param iteration_id The iteration id.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.