fix comment about nodeStatusReportFrequency in kubelet.go

pkg/kubelet/kubelet.go

@@ -1046,7 +1046,7 @@ type Kubelet struct {
 	//    as it takes time to gather all necessary node information.
 	nodeStatusUpdateFrequency time.Duration
 
-	// nodeStatusUpdateFrequency is the frequency that kubelet posts node
+	// nodeStatusReportFrequency is the frequency that kubelet posts node
 	// status to master. It is only used when node lease feature is enabled.
 	nodeStatusReportFrequency time.Duration