batman-adv: Add kerneldoc for batadv_neigh_node::refcount

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>

net/batman-adv/types.h

@@ -371,6 +371,7 @@ struct batadv_hardif_neigh_node {
  * @ifinfo_lock: lock protecting private ifinfo members and list
  * @if_incoming: pointer to incoming hard interface
  * @last_seen: when last packet via this neighbor was received
+ * @refcount: number of contexts the object is used
  * @rcu: struct used for freeing in an RCU-safe manner
  */
 struct batadv_neigh_node {