chore: remove an outdated comment, fix Debug for SubscriptionFuture

Signed-off-by: ljedrz <ljedrz@gmail.com>

src/p2p/swarm.rs

@@ -207,7 +207,6 @@ impl NetworkBehaviour for SwarmApi {
             self.connected_peers.remove(peer_id);
         }
         self.connections.remove(closed_addr);
-        // FIXME: should be an error
         self.connect_registry.finish_subscription(
             closed_addr.clone().into(),
             Err("Connection reset by peer".to_owned()),

src/subscription.rs

@@ -417,8 +417,9 @@ impl<T: Debug + PartialEq, E: Debug> fmt::Debug for SubscriptionFuture<T, E> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         write!(
             fmt,
-            "SubscriptionFuture<Output = Result<{}, Cancelled>>",
-            std::any::type_name::<T>()
+            "SubscriptionFuture<Output = Result<{}, {}>>",
+            std::any::type_name::<T>(),
+            std::any::type_name::<E>(),
         )
     }
 }