Tweak docs of StreamMuxer::poll_event
@@ -91,6 +91,9 @@ pub trait StreamMuxer {
/// is ready to be polled, similar to the API of `Stream::poll()`.
/// Only the latest task that was used to call this method may be notified.
///
+ /// It is permissible and common to use this method to perform background
+ /// work, such as processing incoming packets and polling timers.
+ ///
/// An error can be generated if the connection has been closed.
fn poll_event(&self, cx: &mut Context<'_>) -> Poll<Result<StreamMuxerEvent<Self::Substream>, Self::Error>>;
