fix typo

Signed-off-by: Jakub Sztandera <[email protected]>

equivocation.go

@@ -69,7 +69,7 @@ func (ef *equivocationFilter) ProcessBroadcast(peerID peer.ID, m *gpbft.GMessage
 		ef.activeSenders[m.Sender] = senders
 	}
 
-	// if there are mulltiple senders, only broadcast if we are the smallest one
+	// if there are multiple senders, only broadcast if we are the smallest one
 	return senders[0] == peerID
 }