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- Update outdated files in dev-1.18-ko.7 (#22128)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/tasks/access-application-cluster/access-cluster.md

@@ -145,7 +145,7 @@ curl $APISERVER/api --header "Authorization: Bearer $TOKEN" --insecure
 위 예제에서는 `--insecure` flag를 사용했다. 이는 MITM 공격을 받을 수 있는 상태로 
 두는 것이다. kubectl로 클러스터에 접속할 때 저장된 root 인증서와 클라이언트 인증서들을 
 서버 접속에 사용한다.
-(이들은 `~/.kube` 디렉토리에 설치된다.) 
+(이들은 `~/.kube` 디렉터리에 설치된다.) 
 일반적으로 self-signed 인증서가 클러스터 인증서로 사용되므로 당신의 http 클라이언트가 
 root 인증서를 사용하려면 특수한 설정을 필요로 할 것이다.