remove duplicate words in files

cmd/kube-scheduler/app/options/insecure_serving.go

@@ -28,7 +28,7 @@ import (
 	kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
 )
 
-// CombinedInsecureServingOptions sets up up to two insecure listeners for healthz and metrics. The flags
+// CombinedInsecureServingOptions sets up to two insecure listeners for healthz and metrics. The flags
 // override the ComponentConfig and DeprecatedInsecureServingOptions values for both.
 type CombinedInsecureServingOptions struct {
 	Healthz *apiserveroptions.DeprecatedInsecureServingOptions

cmd/kubeadm/app/phases/upgrade/staticpods.go

@@ -511,7 +511,7 @@ func rollbackOldManifests(oldManifests map[string]string, origErr error, pathMgr
 	return fmt.Errorf("couldn't upgrade control plane. kubeadm has tried to recover everything into the earlier state. Errors faced: %v", errs)
 }
 
-// rollbackEtcdData rolls back the the content of etcd folder if something went wrong.
+// rollbackEtcdData rolls back the content of etcd folder if something went wrong.
 // When the folder contents are successfully rolled back, nil is returned, otherwise an error is returned.
 func rollbackEtcdData(cfg *kubeadmapi.InitConfiguration, pathMgr StaticPodPathManager) error {
 	backupEtcdDir := pathMgr.BackupEtcdDir()

cmd/kubeadm/app/preflight/checks.go

@@ -501,7 +501,7 @@ func (subnet HTTPProxyCIDRCheck) Check() (warnings, errors []error) {
 	return nil, nil
 }
 
-// SystemVerificationCheck defines struct used for for running the system verification node check in test/e2e_node/system
+// SystemVerificationCheck defines struct used for running the system verification node check in test/e2e_node/system
 type SystemVerificationCheck struct {
 	IsDocker bool
 }