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- Update outdated files in dev-1.18-ko.7 (#22128)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/setup/best-practices/certificates.md

@@ -36,7 +36,7 @@ etcd 역시 클라이언트와 피어 간에 상호 TLS 인증을 구현한다.
 
 ## 인증서를 저장하는 위치
 
-만약 쿠버네티스를 kubeadm으로 설치했다면 인증서는 `/etc/kubernets/pki`에 저장된다. 이 문서에 언급된 모든 파일 경로는 그 디렉토리에 상대적이다.
+만약 쿠버네티스를 kubeadm으로 설치했다면 인증서는 `/etc/kubernets/pki`에 저장된다. 이 문서에 언급된 모든 파일 경로는 그 디렉터리에 상대적이다.
 
 ## 인증서 수동 설정