Documentation: 2379 port mistake

Documentation/tuning.md

@@ -75,8 +75,8 @@ These errors may be resolved by prioritizing etcd's peer traffic over its client
 tc qdisc add dev eth0 root handle 1: prio bands 3
 tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip sport 2380 0xffff flowid 1:1
 tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip dport 2380 0xffff flowid 1:1
-tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip sport 2739 0xffff flowid 1:1
-tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip dport 2739 0xffff flowid 1:1
+tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip sport 2379 0xffff flowid 1:1
+tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip dport 2379 0xffff flowid 1:1
 ```
 
 [ping]: https://en.wikipedia.org/wiki/Ping_(networking_utility)