CalendarStyle: document available styleData properties
CalendarStyle: document available styleData properties

Change-Id: I0eb2a3ef443fe0827cb6b5d1d4bfa44543025906
Reviewed-by: Mitch Curtis <a74594a5101269175fe1b140badc4c0b6f699d25@digia.com>

mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols