Fourth Korean l10n work for release 1.18

- Translate docs/reference/issues-security/_index.md into Korean (#21145)
- Translate tasks/administer-cluster/kubeadm/adding-windows-nodes.md into Korean (#21003)
- Translate manage-resources/memory-default-namespace.md into Korean (#21089)
- Translate tasks/configure-pod-container/pull-image-private-registry in Korean (#21036)
- Translate contribute/advanced.md into Korean (#21002)
- Update to Outdated files in the dev-1.18-ko.4 branch. (#21102)
- Translate manage-resources/cpu-constraint-namespace.md into Korean (#21048)
- Translate manage-resources/memory-constraint-namespace.md into Korean (#21091)
- Translate setup/release/notes.md in Korean (#21158)
- Translate manage-resources/quota-pod-namespace.md into Korean (#21087)
- Translate tasks/administer-cluster/kubeadm/upgrading-windows-nodes.md into Korean (#20999)
- Translate tasks/administer-cluster/kubeadm/kubeadm-certs.md into Korean (#21000)
- Translate manage-resources/quota-memory-cpu-namespace.md into Korean (#21088)
- Translate manage-resources/cpu-default-namespace.md into Korean (#21090)
- Translate contribute/suggesting-improvements.md into Korean (#21001)
- Translate quality-service-pod in Korean (#21081)

Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: Jesang Myung <jesang.myung@gmail.com>
Co-authored-by: DongMoon Kim <dmoons.kim@gmail.com>
Co-authored-by: Jesang Myung <jesang.myung@gmail.com>
Co-authored-by: Yuk, Yongsu <ysyukr@gmail.com>
Co-authored-by: bluefriday <bluefriday86@gmail.com>

content/ko/docs/tasks/access-application-cluster/access-cluster.md

@@ -277,7 +277,7 @@ heapster is running at https://104.197.5.247/api/v1/namespaces/kube-system/servi
 예를 들어 위 클러스터는 클러스터 수준의 logging(Elasticsearch 사용)이 활성화되었으므로 적절한 인증을 통과하여 
 `https://104.197.5.247/api/v1/namespaces/kube-system/services/elasticsearch-logging/proxy/`로 액세스할 수 있다. 예를 들어 kubectl proxy로 
 `http://localhost:8080/api/v1/namespaces/kube-system/services/elasticsearch-logging/proxy/`를 통해 logging에 액세스할 수도 있다.
-(인증을 통과하는 방법이나 kubectl proxy를 사용하는 것은 [위 내용](#rest-api에-직접-액세스)을 참조한다.)
+(인증을 통과하는 방법이나 kubectl proxy를 사용하는 것은 [쿠버네티스 API를 사용해서 클러스터에 접근하기](/docs/tasks/administer-cluster/access-cluster-api/)을 참조한다.)
 
 #### 수작업으로 apiserver proxy URL을 구축
 

content/ko/docs/tasks/access-application-cluster/configure-access-multiple-clusters.md

@@ -346,7 +346,7 @@ export KUBECONFIG=$KUBECONFIG:$HOME/.kube/config
 ```
 ### Windows Powershell
 ```shell
- $Env:KUBECONFIG=($Env:KUBECONFIG;$HOME/.kube/config)
+ $Env:KUBECONFIG="$Env:KUBECONFIG;$HOME\.kube\config"
 ```
 
 이제 `KUBECONFIG` 환경 변수에 리스트에 포함된 모든 파일들이 합쳐진 구성 정보를 보자. 

content/ko/docs/tasks/access-application-cluster/web-ui-dashboard.md

@@ -93,7 +93,7 @@ Kubeconfig 인증 방법은 외부 아이덴티티 프로파이더 또는 x509
 
   예를 들면:
 
-  ```conf
+```conf
 release=1.0
 tier=frontend
 environment=pod