Documentation: Add description of netdevsim traps

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/dev.c

@@ -323,6 +323,9 @@ struct nsim_trap_data {
 	spinlock_t trap_lock;	/* Protects trap_items_arr */
 };
 
+/* All driver-specific traps must be documented in
+ * Documentation/networking/devlink-trap-netdevsim.rst
+ */
 enum {
 	NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 	NSIM_TRAP_ID_FID_MISS,