Upgrade-path notes

Probably a really dumb question with an obvious answer.
Are there upgrade-path notes anywhere?
For example, where is the different call pattern for UI-Tabs
documented?
In the current version of ui, we use $("#MyContainer").tabs() to call
tabs, whereas the prior version of UI, we used $
("#MyUnorderedList").tabs().
Is there a place where such version differences are laid-out?
Thanks!