Eighth Korean l10n work for release 1.18

- Translate tasks/administer-cluster/declare-network-policy in Korean (#22526)
- Translate tasks/debug-application-cluster/debug-init-containers in Korean (#22608)
- Fix a missing markdown syntax to enable external link (#22661)
- Translate tasks/administer-cluster/change-pv-reclaim-policy in Korean (#22551)
- Update docs/contribute/participate/ for Korean (#22605)
- Update outdated files in dev-1.18-ko.8 (#22466)
- Translate tasks/administer-cluster/dns-custom-nameservers in Korean (#22524)

Co-authored-by: Daehyun Paik <paik@a30a.dev>
Co-authored-by: Jerry Park <jaehwa@gmail.com>
Co-authored-by: bluefriday <bluefriday86@gmail.com>
Co-authored-by: June Yi <june.yi@samsung.com>
Co-authored-by: Jesang Myung <jesang.myung@gmail.com>
Co-authored-by: Seokho Son <shsongist@gmail.com>

content/ko/examples/service/networking/nginx-policy.yaml

@@ -0,0 +1,13 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: access-nginx
+spec:
+  podSelector:
+    matchLabels:
+      app: nginx
+  ingress:
+  - from:
+    - podSelector:
+        matchLabels:
+          access: "true"