Documentation: bonding: fix the doc of peer_notif_delay

Bonding only supports setting peer_notif_delay with miimon set.

Fixes: 0307d589 ("bonding: add documentation for peer_notif_delay")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/bonding.rst

@@ -776,10 +776,11 @@ peer_notif_delay
 	Specify the delay, in milliseconds, between each peer
 	notification (gratuitous ARP and unsolicited IPv6 Neighbor
 	Advertisement) when they are issued after a failover event.
-	This delay should be a multiple of the link monitor interval
-	(arp_interval or miimon, whichever is active). The default
-	value is 0 which means to match the value of the link monitor
-	interval.
+	This delay should be a multiple of the MII link monitor interval
+	(miimon).
+
+	The valid range is 0 - 300000. The default value is 0, which means
+	to match the value of the MII link monitor interval.
 
 prio
 	Slave priority. A higher number means higher priority.