Fix documentation typos

doc.go

@@ -46,8 +46,7 @@
 // method to get an io.WriteCloser, write the message to the writer and close
 // the writer when done. To receive a message, call the connection NextReader
 // method to get an io.Reader and read until io.EOF is returned. This snippet
-// snippet shows how to echo messages using the NextWriter and NextReader
-// methods:
+// shows how to echo messages using the NextWriter and NextReader methods:
 //
 //  for {
 //      messageType, r, err := conn.NextReader()