prioritySend, receive, receiveOnly are not documented at all (oddly enough they are documented in TDPL..). There's also a List struct in the docs but it doesn't say what it's for. send() is poorly documented. It doesn't state what types you're allowed to send, or what happens if you send a value to a Tid of a terminated thread. There are no examples either. It's quite a contrast compared to how well std.parallelism is documented.
https://github.com/D-Programming-Language/phobos/commit/93ccd0cfb3390d7840dff6bf6f563ac23cf93c87