Fix 3 typos

node/hello/hello.go

@@ -63,7 +63,7 @@ func (hs *Service) HandleStream(s inet.Stream) {
 
 	var hmsg HelloMessage
 	if err := cborutil.ReadCborRPC(s, &hmsg); err != nil {
-		log.Infow("failed to read hello message, diconnecting", "error", err)
+		log.Infow("failed to read hello message, disconnecting", "error", err)
 		s.Conn().Close()
 		return
 	}