add help desc

package/iptables/Config.in

@@ -1,8 +1,7 @@
-#
-
 config BR2_PACKAGE_IPTABLES
-	bool"iptables"
+	bool "iptables"
 	default n
 	help
-	  Add help text here.
+	  Linux kernel (2.4+) firewall, NAT, and packet mangling tools.
 
+	  http://www.iptables.org/