791: Channel clarification r=lulf a=diondokter

This was unclear from the docs.

Co-authored-by: Dion Dokter <diondokter@gmail.com>
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@ -3,6 +3,9 @@
//! It can be used concurrently by multiple producers (senders) and multiple
//! consumers (receivers), i.e. it is an "MPMC channel".
//!
//! Receivers are competing for messages. So a message that is received by
//! one receiver is not received by any other.
//!
//! This queue takes a Mutex type so that various
//! targets can be attained. For example, a ThreadModeMutex can be used
//! for single-core Cortex-M targets where messages are only passed