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- Update outdated files in dev-1.18-ko.6 partly (#21714)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- update outdated docs (#21940)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- Update to Outdated files in the dev-1.18-ko.6 branch - (1/4) (#21911)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- Update outdated dev-1.18-ko.6 partly (#22067)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/concepts/services-networking/dual-stack.md

@@ -47,7 +47,7 @@ IPv4/IPv6 이중 스택을 활성화 하려면, 클러스터의 관련 구성요
       * `--feature-gates="IPv6DualStack=true"`
       * `--cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>`
       * `--service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>`
-      * `--node-cidr-mask-size-ipv4|--node-cidr-mask-size-ipv6` IPv4의 기본값은 /24 이고 IPv6의 기본값은 /64이다.
+      * `--node-cidr-mask-size-ipv4|--node-cidr-mask-size-ipv6` IPv4의 기본값은 /24 이고 IPv6의 기본값은 /64 이다.
    * kubelet:
       * `--feature-gates="IPv6DualStack=true"`
    * kube-proxy: