sch_htb: fix doc warning in htb_activate_prios()

Add description for parameters of htb_activate_prios()
to fix gcc W=1 warnings:

net/sched/sch_htb.c:407: warning: Function parameter or member 'q' not described in 'htb_activate_prios'
net/sched/sch_htb.c:407: warning: Function parameter or member 'cl' not described in 'htb_activate_prios'
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_htb.c

@@ -411,6 +411,8 @@ static inline void htb_remove_class_from_row(struct htb_sched *q,
 
 /**
  * htb_activate_prios - creates active classe's feed chain
+ * @q: the priority event queue
+ * @cl: the class to activate
  *
  * The class is connected to ancestors and/or appropriate rows
  * for priorities it is participating on. cl->cmode must be new