We need to be more explicit here. I'd suggest a separate Android Platform Notes section so we don't have to have two qualifiers in the opening sentence, something like:

Android Platform Notes

Prior to SDK 3.0, activity indicator on Android produced a modal dialog containing a spinner or progress bar. In SDK 3.0, this legacy Android activity indicator was renamed to <Titanium.UI.Android.ProgressIndicator>. 

In SDK 3.0, use ActivityIndicator for a view that can be added as a child of another view. Use `ProgressIndicator` to display a progress indicator in a modal dialog or in the window title bar.