'ant checkintests' no longer runs the 'doc' target.
This change was blessed by Lauren and Deepa. Currently the 'doc' target is causing out-of-memory errors on some machines. But even after this is fixed, we don't want to go back to having 'checkintests' do 'doc' because it takes too long and isn't necessary on every checkin.
QE Notes: None
Doc Notes: None