Bug in doxygen for adding headers to a response via render #attached

Looking at the generated doc here, the example shown for a header is nested one level too deep in the array

https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21...

It should either be written as one of these (they differ only by formatting):

$build['#attached']['http_header'][] = ['Content-Type', 'application/rss+xml; charset=utf-8'];

or

$build['#attached']['http_header'] = [
  ['Content-Type', 'application/rss+xml; charset=utf-8'],
];