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- Update outdated files in dev-1.18-ko.6 partly (#21714)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- update outdated docs (#21940)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- Update to Outdated files in the dev-1.18-ko.6 branch - (1/4) (#21911)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- Update outdated dev-1.18-ko.6 partly (#22067)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/tutorials/kubernetes-basics/scale/scale-intro.html

@@ -30,7 +30,7 @@ weight: 10
                 <p>지난 모듈에서 <a href="/ko/docs/concepts/workloads/controllers/deployment/"> 디플로이먼트</a>를 만들고,
                     <a href="/docs/concepts/services-networking/service/">서비스</a>를
                     통해서 디플로이먼트를 외부에 노출시켜 봤다. 해당 디플로이먼트는 애플리케이션을 구동하기 위해 단
-                    하나의 파드(Pod)만을 생성했었다. 트래픽이 증가하면, 사용자 요청에 맞추어 애플리케이션의 규모를
+                    하나의 파드만을 생성했었다. 트래픽이 증가하면, 사용자 요청에 맞추어 애플리케이션의 규모를
                     조정할 필요가 있다.</p>
 
                 <p>디플로이먼트의 복제 수를 변경하면 <b>스케일링</b>이 수행된다</p>