[NETFILTER]: Update modules' descriptions

Updates the MODULE_DESCRIPTION() tags for all Netfilter modules,
actually describing what the module does and not just
"netfilter XYZ target".

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/xt_NOTRACK.c b/net/netfilter/xt_NOTRACK.c
index 95712e4..6c9de61 100644
--- a/net/netfilter/xt_NOTRACK.c
+++ b/net/netfilter/xt_NOTRACK.c
@@ -7,6 +7,7 @@
 #include <linux/netfilter/x_tables.h>
 #include <net/netfilter/nf_conntrack.h>
 
+MODULE_DESCRIPTION("Xtables: Disabling connection tracking for packets");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_NOTRACK");
 MODULE_ALIAS("ip6t_NOTRACK");