Clarify commandline arguments

README.md

@@ -22,9 +22,9 @@ Usage:
     $GOPATH/bin/fritzbox_exporter -h
     Usage of ./fritzbox_exporter:
       -gateway-address string
-        	The URL of the upnp service (default "fritz.box")
+        	The hostname or IP of the FRITZ!Box (default "fritz.box")
       -gateway-port int
-        	The URL of the upnp service (default 49000)
+        	The port of the FRITZ!Box UPnP service (default 49000)
       -listen-address string
         	The address to listen on for HTTP requests. (default ":9133")
       -test

main.go

@@ -32,8 +32,8 @@ var (
 	flag_test = flag.Bool("test", false, "print all available metrics to stdout")
 	flag_addr = flag.String("listen-address", ":9133", "The address to listen on for HTTP requests.")
 
-	flag_gateway_address = flag.String("gateway-address", "fritz.box", "The URL of the upnp service")
+	flag_gateway_address = flag.String("gateway-address", "fritz.box", "The hostname or IP of the FRITZ!Box")
-	flag_gateway_port    = flag.Int("gateway-port", 49000, "The URL of the upnp service")
+	flag_gateway_port    = flag.Int("gateway-port", 49000, "The port of the FRITZ!Box UPnP service")
 )
 
 var (