https://api.drupal.org/api/drupal/developer%21topics%21forms_api_referen...
The "Drupal AJAX framework" link in the section is wrong and should lead to https://api.drupal.org/api/drupal/includes%21ajax.inc/group/ajax/7.x
The AJAX Commands link on the next section is also wrong and should lead to
https://api.drupal.org/api/drupal/includes%21ajax.inc/group/ajax_command...
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Missing documentation
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