make sure peer/error.s comments are up to date

zebra-network/src/peer/error.rs

@@ -8,6 +8,9 @@ use zebra_chain::serialization::SerializationError;
 use crate::protocol::external::InventoryHash;
 
 /// A wrapper around `Arc<PeerError>` that implements `Error`.
+// TODO soon this Wrapper will not be necessary. Once
+// https://github.com/rust-lang/rust/pull/80553 lands on stable we should
+// replace this with a type alias.
 #[derive(Error, Debug, Clone)]
 #[error(transparent)]
 pub struct SharedPeerError(Arc<TracedError<PeerError>>);