Sixth Korean l10n work for release 1.18

- Update outdated files in dev-1.18-ko.6 partly (#21714)
- Translate StorageClass to Korean word (#21805)
- Translate StatefulSet to Korean word in pods.md (#21794)
- Translate tasks/run-application/delete-stateful-set/ in Korean (#21686)
- Translate tasks/administer-cluster/change-default-storage-class in Korean (#21801)
- update outdated docs (#21940)
- Modify spacing term StatefulSet in Korean (#21871)
- Translate /tasks/administer-cluster/coredns in Korean (#21876)
- Fix typo in k8s.io/ko/docs/contribute/new-content/new-content/ (#21975)
- Translation error correction in /concepts/containers/runtime-class.md (#21868)
- Translate tasks/tls/certificate-rotation/ in Korean (#21838)
- Translate /tasks/configure-pod-container/static-pod in Korean (#21798)
- Update to Outdated files in the dev-1.18-ko.6 branch - (1/4) (#21911)
- Fix English bugs in Korean documentation (#21994)
- Update outdated dev-1.18-ko.6 partly (#22067)

Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: PyungHo Yoon <learder@gmail.com>
Co-authored-by: Yuk, Yongsu <ysyukr@gmail.com>
Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: Seokho Son <shsongist@gmail.com>
Co-authored-by: Jordy Ruiter <jordy.ruiter@gmail.com>
Co-authored-by: bluefriday <bluefriday86@gmail.com>
Co-authored-by: Dajin Gwon <d.gweon@samsung.com>
Co-authored-by: Hyungseok Lee <hs0426.lee@samsung.com>
Co-authored-by: Jihoon Seo <jihoon.seo@etri.re.kr>
Co-authored-by: coolguyhong <podolsmith@naver.com>
Co-authored-by: jmyung <jesang.myung@gmail.com>
Co-authored-by: June Yi <june.yi@samsung.com>

content/ko/docs/home/_index.md

@@ -43,7 +43,7 @@ cards:
   title: "교육"
   description: "공인 쿠버네티스 인증을 획득하고 클라우드 네이티브 프로젝트를 성공적으로 수행하세요!"
   button: "교육 보기"
-  button_path: "/training"  
+  button_path: "/training"
 - name: reference
   title: 레퍼런스 정보 찾기
   description: 용어, 커맨드 라인 구문, API 자원 종류, 그리고 설치 툴 문서를 살펴본다.
@@ -54,8 +54,8 @@ cards:
   description: 이 프로젝트가 처음인 사람이든, 오래 활동한 사람이든 상관없이 누구나 기여할 수 있다.
   button: 문서에 기여하기
   button_path: "/ko/docs/contribute"
-- name: download
-  title: 쿠버네티스 내려받기
+- name: release-notes
+  title: 릴리스 노트
   description: 쿠버네티스를 설치하거나 최신의 버전으로 업그레이드하는 경우, 현재 릴리스 노트를 참고한다.
 - name: about
   title: 문서에 대하여