Update bounded.md (google#1919)

Shouldn't it be `recv` instead of `read`? I don't see a `read` function
in Receiver.

src/concurrency/channels/bounded.md

@@ -34,6 +34,6 @@ fn main() {
 - A call to `send` will abort with an error (that is why it returns `Result`) if
   the channel is closed. A channel is closed when the receiver is dropped.
 - A bounded channel with a size of zero is called a "rendezvous channel". Every
-  send will block the current thread until another thread calls `read`.
+  send will block the current thread until another thread calls `recv`.
 
 </details>