Ko: 1st Korean l10n work for release-1.20

- Translate reference/glossary/persistent-volume.md in Korean (#25474)
- Update outdated files in the dev-1.20-ko.1 branch (1) (#25576)
- Translate blog/dont-panic-kubernetes-and-docker into Korean (#25596)
- Update outdated files in the dev-1.20-ko.1 branch(3) (#25728)
- Ko: enhance tutorials//cluster-intro translation (#25754)
- Fix Outdated files in the dev-1.20-ko.1 branch (2) (#25765)

Co-authored-by: seokho-son <shsongist@gmail.com>
Co-authored-by: jmyung <jesang.myung@gmail.com>
Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: santachopa <santachopa@naver.com>
Co-authored-by: SEUNGHYUN KO <kosehy@gmail.com>
Co-authored-by: June Yi <gochist@gmail.com>

content/ko/docs/concepts/scheduling-eviction/pod-overhead.md

@@ -44,7 +44,7 @@ _파드 오버헤드_ 는 컨테이너 리소스 요청과 상한 위에서 파
 ```yaml
 ---
 kind: RuntimeClass
-apiVersion: node.k8s.io/v1beta1
+apiVersion: node.k8s.io/v1
 metadata:
     name: kata-fc
 handler: kata-fc