fixed typos

examples/multipro/main.go

@@ -46,6 +46,7 @@ func main() {
 
 	log.Printf("This is a conversation between %s and %s\n", h1.host.ID(), h2.host.ID())
 
+	// send messages using the protocols
 	h1.pingProtocol.Ping(h2)
 	h2.pingProtocol.Ping(h1)
 	h1.echoProtocol.Echo(h2)

examples/multipro/node.go

@@ -46,7 +46,7 @@ func NewMessageData(nodeId string, messageId string, gossip bool) *p2p.MessageDa
 type Node struct {
 	host         host.Host     // lib-p2p host
 	pingProtocol *PingProtocol // ping protocol impl
-	echoProtocol *EchoProtocol // echp protocl imp
+	echoProtocol *EchoProtocol // echo protocol impl
 }
 
 // create a new node with its implemented protocols