added comments for clarity

Author: jeremyalangreen

libraries/ESP8266SSDP/ESP8266SSDP.cpp

@@ -70,7 +70,7 @@ static const char* _ssdp_packet_template =
   "CACHE-CONTROL: max-age=%u\r\n" // SSDP_INTERVAL
   "SERVER: Arduino/1.0 UPNP/1.1 %s/%s\r\n" // _modelName, _modelNumber
   "USN: uuid:%s\r\n" // _uuid
-  "%s: %s\r\n"
+  "%s: %s\r\n"  // "NT" or "ST", _deviceType
   "LOCATION: http://%u.%u.%u.%u:%u/%s\r\n" // WiFi.localIP(), _port, _schemaURL
   "\r\n";