channel doc: Fix misleading reference to None return on Receiver
@@ -22,8 +22,8 @@ use crate::sync::WakerSet;
/// This channel has a buffer that can hold at most `cap` messages at a time.
///
/// Senders and receivers can be cloned. When all senders associated with a channel get dropped, it
-/// becomes closed. Receive operations on a closed and empty channel return `None` instead of
-/// trying to await a message.
+/// becomes closed. Receive operations on a closed and empty channel return [RecvError] instead of
+/// trying to await a message when using [Receiver::recv] or `None` when used as a [Stream].
///
/// # Panics
///
@@ -376,7 +376,7 @@ impl<T> Receiver<T> {
///
/// If the channel is empty and still has senders, this method
/// will wait until a message is sent into it. Once all senders
- /// have been dropped it will return `None`.
+ /// have been dropped it will return [RecvError].
///
/// # Examples
///
