[TIDOC-944] Add notes about using the Android ProgressIndicator.  Fix some errors.  Add Alloy XML example.
[TIDOC-944] Add info about using the progress bar in a heavyweight window.
[TIDOC-944] Updates per comments
[TIDOC-944] Update examples
Merge pull request #3662 from bhatfield/tidoc-944

[TIDOC-944] Update information about the Android ProgressIndicator