ax(node): replace prose comment on NewMessageDeduplicator with usage example

Co-Authored-By: Charon <charon@lethean.io>

pkg/node/transport.go

@@ -60,7 +60,9 @@ type MessageDeduplicator struct {
 	ttl  time.Duration
 }
 
-// NewMessageDeduplicator creates a deduplicator with specified TTL
+// dedup := node.NewMessageDeduplicator(5 * time.Minute)
+// dedup.Mark(msg.ID)
+// if dedup.IsDuplicate(msg.ID) { continue }
 func NewMessageDeduplicator(ttl time.Duration) *MessageDeduplicator {
 	d := &MessageDeduplicator{
 		seen: make(map[string]time.Time),