Cluster: barrer -> barrier in redis.conf.

redis.conf

@@ -558,7 +558,7 @@ lua-time-limit 5000
 #
 # Slaves migrate to orphaned masters only if there are still at least a
 # given number of other working slaves for their old master. This number
-# is the "migration barrer". A migration barrier of 1 means that a slave
+# is the "migration barrier". A migration barrier of 1 means that a slave
 # will migrate only if there is at least 1 other working slave for its master
 # and so forth. It usually reflects the number of slaves you want for every
 # master in your cluster.