[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_TRACE.c b/net/netfilter/xt_TRACE.c
index 219b9d2..30dab79a 100644
--- a/net/netfilter/xt_TRACE.c
+++ b/net/netfilter/xt_TRACE.c
@@ -5,6 +5,7 @@
 
 #include <linux/netfilter/x_tables.h>
 
+MODULE_DESCRIPTION("Xtables: packet flow tracing");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_TRACE");
 MODULE_ALIAS("ip6t_TRACE");