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From the jQuery Mobile 1.3.0 Beta blog entry:

New API site: Launching with 1.3!

...

The new API docs are in beta now and when we hit 1.3 final, we’re going to switch over to those as our authoritative place for API info. Our plan is to retire the current docs and have an all-new demos site to accompany the new API docs.

This is close as you're going to get to man-like documentation:  jQuery Mobile API

Please note that this is only applicable for version 1.3.0 which isn't currently a production release.  If you want the same information for 1.2.0 or earlier releases then you have to dig through the online documentation.

Many of the pages containing widget documentation have a button set at the top of the page to view the options, methods, and events for the applicable widget.  See http://jquerymobile.com/demos/1.2.0/docs/lists/docs-lists.html as an example.