added "-- MODES --"-section to help

src/paperctl.sh

@@ -10,6 +10,9 @@ show_help(){
 	echo "  -v      | Print the current application version"
 	echo "  -h      | Show this help text"
 	echo "  -y      | Answer all questions with yes"
+	echo ""
+	echo "-- MODES --"
+	echo "  access  | control over remote access to the device (mac-based-filtering using iptables)"
 	exit 0
 }