Sortable: ui argument in the sort start event is not fully documented

[thoand]

Hi

I am not sure if it is a bug in the documentation or in the sortable code, but I just noticed that the ui argument in the sort start event has a reference to the placeholder (ui.placeholder)

At the moment the documentation says nothing about this: ​http://api.jqueryui.com/sortable/#event-start

Hopefully this is just missing information in the as my start callback relies on the ui.placeholder

[thoand]

I'll guess this also aplies to the other events too

[Scott González]

Could you please file an issue at ​https://github.com/jquery/api.jqueryui.com/issues? Thanks.

[thoand]

done