文档中少了popupAnimation属性

[maxwei]

I can not find the "popupAnimation" props API in document, but it works well in demo dropDownTree. Did we forget to write this props? 我在API中没有找到 "popupAnimation"属性，但这个属性在demo中是有效的，这个是不不因为我们忘记写入文档中了。

[jinyang1994]

少了好多props，比如showAction hideAction