Apple said strong pre-orders of the iPhone 6s and iPhone 6s Plus have put the company on pace to beat last year’s 10 million unit first weekend record, CNBC reports. The company said online demand for the iPhone 6s Plus exceeded its own forecasts and that it’s “working to catch up as quickly as we can,” while still guaranteeing that both iPhone 6s and iPhone 6s Plus units will be available at Apple retail stores when they open…