message: Remove incorrect comment
  Not true, actually.
diff: @@ -306,8 +306,6 @@ pub struct FlowMgr {
  // (stream_type, discriminant) as key ensures only 1 of every frame type
  // per stream type will be queued.
  - // Note: Only StreamsBlocked is scoped on stream type so including disc in
  - // key is just for consistency.
  from_stream_types: HashMap<(StreamType, mem::Discriminant<Frame>), Frame>,
  used_data: u64,
  