Fix comment about NoShardingDistributionFunction and NoShardingAlgorithm

Signed-off-by: Akram Ben Aissi <akram.benaissi@gmail.com>

controller/sharding/sharding.go

@@ -157,7 +157,7 @@ func RoundRobinDistributionFunction(clusters clusterAccessor, replicas int) Dist
 	}
 }
 
-// NoShardingDistributionFunction returns a DistributionFunction that will process all shards
+// NoShardingDistributionFunction returns a DistributionFunction that will process all cluster by shard 0
 // the function is created for API compatibility purposes.
 func NoShardingDistributionFunction() DistributionFunction {
 	return func(c *v1alpha1.Cluster) int { return 0 }