[NETFILTER]: ebtables: Update modules' descriptions

Update the MODULES_DESCRIPTION() tags for all Ebtables modules.

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/bridge/netfilter/ebt_snat.c b/net/bridge/netfilter/ebt_snat.c
index 6bc263c..ed85858 100644
--- a/net/bridge/netfilter/ebt_snat.c
+++ b/net/bridge/netfilter/ebt_snat.c
@@ -88,4 +88,5 @@
 
 module_init(ebt_snat_init);
 module_exit(ebt_snat_fini);
+MODULE_DESCRIPTION("Ebtables: Source MAC address translation");
 MODULE_LICENSE("GPL");