Add deep links to upgrade guide for API changes

[jzaefferer]

For example on the Accordion page, link to the 1.9 upgrade guide describing the changes from 1.8 to 1.9. Same for tabs. Or for dialog and progressbar in 1.10.

This would help anyone who's looking to upgrade his version of jQuery UI, when dealing with issues with a specific component.

Can be just a link and one sentence in the description.

[twhitmorenz]

Hey Jörn --

I raised an issues about the UI Docs myself, concerned with loss of depth (info like Tabs, preventing FOUC).

Scott says this detail should be on the "Learn jQuery" site, which I may or may not agree with, but in any case -- if it were -- it would need to be linked from the API site for anybody to actually find it.

#121

My preference is probably not for Usage Guide/ Usage Notes to be on a separate site, but be a closely-linked page on the same site.

I think "Upgrade Guides" should fall in the same situation; they are wanted closely-linked on the "API Docs" site, and need to be easily linked to so people can find them, not hidden in a distant galaxy far-far away.

What are your thoughts?

[jzaefferer]

Hard to tell if this is still useful. We should do this for future releases though.