Fix httpmsg example

Author: addshore

examples/httpmsg.toit

@@ -13,7 +13,7 @@ main:
 
   // Start the HTTP Message server on port 80
   // This allows communicating with the device via a HTTP page
-  services.HttpMsg device.name comms --serve=true
+  services.HttpMsg device comms --serve=true
 
   // And start a service that prints all received messages to the console
   // To see the messages, `jag monitor` the device that is running this code