hook_toolbar example defines the classes in the wrong location

I don't understand what's going on with this issue.

The IS and patch #12 say that this is about documentation and patch 12 is a fix to api.php documentation.

Then patch 14 is TOTALLY different and changes a test!!!

Also, I did a quick test, and BOTH ways of setting a class work:

function toolbar_toolbar() {
  // The 'Home' tab is a simple link, with no corresponding tray.
  $items['home'] = [
    '#type' => 'toolbar_item',
    'tab' => [
      '#type' => 'link',
      '#title' => t('Back to site'),
      '#url' => Url::fromRoute('<front>'),
      '#attributes' => [
        'title' => t('Return to site content'),
        'class' => ['toolbar-icon', 'toolbar-icon-escape-admin'],
        'data-toolbar-escape-admin' => TRUE,
      ],
      '#options' => [
        'attributes' => [
          'title' => t('Home page'),
          'class' => ['toolbar-icon', 'toolbar-icon-THIS-WORKS-TOO-and-overrides-#attributes'],
        ],
      ],
    ],

Though the docs should reflect what is current usage, which is what patch #12 is doing.