Ko: Third Korean l10n work for release-1.20

- Update outdated files in the dev-1.20-ko.3 (1) (#26131)
- Update outdated files in the dev-1.20-ko.3 branch (2) (#26122)

Co-authored-by: seokho-son <shsongist@gmail.com>
Co-authored-by: Jerry Park <jaehwa@gmail.com>

content/ko/examples/application/deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: nginx-deployment

content/ko/examples/application/guestbook/frontend-deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: frontend

content/ko/examples/application/guestbook/redis-master-deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: redis-master

content/ko/examples/application/guestbook/redis-slave-deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: redis-slave

content/ko/examples/application/mysql/mysql-deployment.yaml

@@ -9,7 +9,7 @@ spec:
     app: mysql
   clusterIP: None
 ---
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: mysql

content/ko/examples/application/wordpress/mysql-deployment.yaml

@@ -25,7 +25,7 @@ spec:
     requests:
       storage: 20Gi
 ---
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: wordpress-mysql

content/ko/examples/application/wordpress/wordpress-deployment.yaml

@@ -25,7 +25,7 @@ spec:
     requests:
       storage: 20Gi
 ---
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: wordpress