Confusing or Wrong docs for Migration Guide - regarding `.thumbnail`

Created by: jvanasco

In the migration guide, it states under major class changes ( http://getbootstrap.com/getting-started/ )

old: .thumbnail

new: .img-thumbnail

however:

1. The 3.0 docs still use .thumbnail http://getbootstrap.com/components/#thumbnails
2. Rendering with .img-thumbnail is not the same http://bootply.com/82654
3. Visually, .thumbnail on 3.0 and 2.3.2 are the same ( http://getbootstrap.com/2.3.2/components.html#thumbnails );