net: Add missing kernel-doc for netdev ptype lists

.//include/linux/netdevice.h:1826: warning: No description found for parameter 'ptype_all'
.//include/linux/netdevice.h:1826: warning: No description found for parameter 'ptype_specific'

Introduced by commit 7866a621 ("dev: add per net_device packet type
chains")

Cc: Salam Noureddine <noureddine@arista.com>
Signed-off-by: NBenjamin Poirier <bpoirier@suse.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -1418,6 +1418,8 @@ enum netdev_priv_flags {
  *	@unreg_list:	List entry, that is used, when we are unregistering the
  *			device, see the function unregister_netdev
  *	@close_list:	List entry, that is used, when we are closing the device
+ *	@ptype_all:     Device-specific packet handlers for all protocols
+ *	@ptype_specific: Device-specific, protocol-specific packet handlers
  *
  *	@adj_list:	Directly linked devices, like slaves for bonding
  *	@all_adj_list:	All linked devices, *including* neighbours