tipc: fix kernel-doc warnings

Fix kernel-doc warning introduced in
commit b83e214b ("tipc: add extack messages for bearer/media failure"):

net/tipc/bearer.c:248: warning: Function parameter or member 'extack' not described in 'tipc_enable_bearer'

Fixes: b83e214b ("tipc: add extack messages for bearer/media failure")
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/bearer.c

@@ -240,6 +240,7 @@ void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
  * @disc_domain: bearer domain
  * @prio: bearer priority
  * @attr: nlattr array
+ * @extack: netlink extended ack
  */
 static int tipc_enable_bearer(struct net *net, const char *name,
 			      u32 disc_domain, u32 prio,