Fifth Korean l10n work for release-1.15 (#16231)

* Translate `concepts/scheduling/_index.md` to Korean (#16072)
* Translate concepts/workloads/controllers/replicaset.md in Korean (#16070)
* Update outdated content in dev-1.15-ko.5 (#16162)
* Translate using-api/client-libraries into korean (#16182)
* ko: translate concepts/cluster-administration/proxies (#16030)
* Translate concepts/workloads/controllers/deployment.md in Korean (#16113)

Co-Authored-By: Seokho Son <shsongist@gmail.com>
Co-Authored-By: Eden <longlg88@naver.com>
Co-Authored-By: Yoon <learder@gmail.com>
Co-Authored-By: Sunghoon Kang <me@devholic.io>
Co-Authored-By: Yuk, Yongsu <ysyukr@gmail.com>
Co-Authored-By: June Yi <gochist@gmail.com>

content/ko/examples/pods/pod-rs.yaml

@@ -0,0 +1,23 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod1
+  labels:
+    tier: frontend
+spec:
+  containers:
+  - name: hello1
+    image: gcr.io/google-samples/hello-app:2.0
+
+---
+
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod2
+  labels:
+    tier: frontend
+spec:
+  containers:
+  - name: hello2
+    image: gcr.io/google-samples/hello-app:1.0