Seventh Korean l10n work for release 1.18

- Translate reference/command-line-tools-reference/feature-gates.md int… (#22240)
- Fix issue of broken links to translated docs (#22105)
- Fix issue of document link in some ko documents (#22379)
- Translate tasks/administer-cluster/access-cluster-services.md into Ko… (#21776)
- Fix issue with 'Linux' and 'Windows' notation in Korean docs (#22362)
- Fix issue of broken links to translated docs #2 (#22270)
- Fix issue with k8s.io/ko/docs/concepts/overview/kubernetes-api.md (#22261)
- Fix issue with k8s.io/ko/docs/concepts/overview/working-with-objects/ (#22263)
- Fix incorrect notation of 'directory' into Korean (#22155)
- Fix issue with k8s.io/ko/docs/concepts/overview/components.md (#22232)
- Update outdated files in dev-1.18-ko.7 (#22128)
- Modify spacing term ReplicaSet in Korean (#22148)
- Translate tasks/administer-cluster/extended-resource-node.md into Korean (#21849)
- Translate tasks/administer-cluster/access-cluster-api.md into Korean (#21730)

Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: woopyoung <ywp041@gmail.com>
Co-authored-by: coolguyhong <podolsmith@naver.com>
Co-authored-by: PyungHo Yoon <learder@gmail.com>
Co-authored-by: Seokho Son <shsongist@gmail.com>
Co-authored-by: jmyung <jesang.myung@gmail.com>
Co-authored-by: Ian Y. Choi <ianyrchoi@gmail.com>

content/ko/docs/concepts/configuration/organize-cluster-access-kubeconfig.md

@@ -58,8 +58,8 @@ kubectl config use-context
 ## KUBECONFIG 환경 변수
 
 `KUBECONFIG` 환경 변수는 kubeconfig 파일 목록을 보유한다.
-Linux 및 Mac의 경우 이는 콜론(:)으로 구분된 목록이다.
-Windows는 세미콜론(;)으로 구분한다. `KUBECONFIG` 환경 변수가 필수는 아니다.
+리눅스 및 Mac의 경우 이는 콜론(:)으로 구분된 목록이다.
+윈도우는 세미콜론(;)으로 구분한다. `KUBECONFIG` 환경 변수가 필수는 아니다.
 `KUBECONFIG` 환경 변수가 없으면,
 `kubectl`은 기본 kubeconfig 파일인 `$HOME/.kube/config`를 사용한다.