FWIW, the quickSort isn't serial either. It's just not as effective at using parallel hardware as the radix sort. In other words, it has limited parallelism. I believe it is an error in the documentation to say proc sort will use a serial quick sort.
I wouldn't change the name of it from quickSort since I wouldn't assume a "quick sort" is Hoare's original sorting code. But either way, I'm expecting that when we stabilize the Sort module, proc sort will be the main interface, and things like quickSort might be deprecated or remain unstable.
But, regarding the proc sort documentation, adjusting it to call it an "improved quick sort" or something like that seems reasonable.