Fix the link for the button form element

The Form API Reference documentation in Drupal 6 & 7 changes in versions 8 and later. The documentation of the new versions is in the part of Form and render elements.

The Form and render elements documentation https://www.drupal.org/docs/drupal-apis/form-api/form-render-elements →

The links added by Josuer are correct. They point to the documentation class that is used for that form element.

Automatically closed - issue fixed for 2 weeks with no activity.