[4.12] fix gofmt check issue in network-metrics-daemon

$ ./hack/check_gofmt.sh
pkg/podmetrics/podmetrics.go

$ git diff
diff --git a/pkg/podmetrics/podmetrics.go b/pkg/podmetrics/podmetrics.go
index f7c386c..8a17f44 100644
--- a/pkg/podmetrics/podmetrics.go
+++ b/pkg/podmetrics/podmetrics.go
@@ -37,7 +37,7 @@ var (
                        "network_name"})
 )
 
-//UpdateForPod adds metrics for all the provided networks to the given pod.
+// UpdateForPod adds metrics for all the provided networks to the given pod.
 func UpdateForPod(podName, namespace string, networks []podnetwork.Network) {
        for _, n := range networks {
                if n.Interface == "" {

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