terminology "USB 4.0" and "USB 4".

In the announcement press release, the USB Promoter Group mentions that USB4 is "based on the Thunderbolt(TM) protocol specification recently contributed by Intel Corporation".Goals stated in the USB4 specification are increasing bandwidth, helping to converge the USB-C connector ecosystem, and "minimize end-user confusion". Some of the key areas to achieve this are using a single USB-C connector type, to offer display and data transfer features, while retaining "compatibility