update exec command

content/en/docs/tutorials/configuration/configure-redis-using-configmap.md

@@ -93,7 +93,7 @@ Use `kubectl exec` to enter the pod and run the `redis-cli` tool to verify that
 the configuration was correctly applied:
 
 ```shell
-kubectl exec -it redis redis-cli
+kubectl exec -it redis -- redis-cli
 127.0.0.1:6379> CONFIG GET maxmemory
 1) "maxmemory"
 2) "2097152"

content/ja/docs/tutorials/configuration/configure-redis-using-configmap.md

@@ -89,7 +89,7 @@ pod/redis   1/1     Running   0          52s
 `kubectl exec`を使ってPodに入り、`redis-cli`ツールを実行して設定が正しく適用されたことを確認してください:
 
 ```shell
-kubectl exec -it redis redis-cli
+kubectl exec -it redis -- redis-cli
 127.0.0.1:6379> CONFIG GET maxmemory
 1) "maxmemory"
 2) "2097152"

content/ko/docs/tutorials/configuration/configure-redis-using-configmap.md

@@ -90,7 +90,7 @@ pod/redis   1/1     Running   0          52s
 `kubectl exec`를 사용해 파드 속에서 `redis-cli` 툴을 실행해 본다.
 
 ```shell
-kubectl exec -it redis redis-cli
+kubectl exec -it redis -- redis-cli
 127.0.0.1:6379> CONFIG GET maxmemory
 1) "maxmemory"
 2) "2097152"

content/zh/docs/tutorials/configuration/configure-redis-using-configmap.md

@@ -136,7 +136,7 @@ the configuration was correctly applied:
 使用 `kubectl exec` 进入 pod 并运行 `redis-cli` 工具来验证配置已正确应用：
 
 ```shell
-kubectl exec -it redis redis-cli
+kubectl exec -it redis -- redis-cli
 127.0.0.1:6379> CONFIG GET maxmemory
 1) "maxmemory"
 2) "2097152"