yui/yui3 — pull request #1861 by okuryu (2014-06-11 12:08:09+00:00)
Title: [widget-parent] Fix docs about add() and _add() methods

These methods actually accept 2 params.

* http://yuilibrary.com/yui/docs/api/classes/WidgetParent.html#method__add
* http://yuilibrary.com/yui/docs/api/classes/WidgetParent.html#method_add

Fix #1639.