deprecated kubectl run command flag replicas for zh

Signed-off-by: Weiping Cai <weiping.cai@daocloud.io>

content/zh/docs/tasks/administer-cluster/declare-network-policy.md

@@ -36,7 +36,7 @@ content_template: templates/task
 为了查看 Kubernetes 网络策略是怎样工作的，可以从创建一个`nginx` deployment 并且通过服务将其暴露开始
 
 ```console
-$ kubectl run nginx --image=nginx --replicas=2
+$ kubectl create deployment nginx --image=nginx
 deployment "nginx" created
 $ kubectl expose deployment nginx --port=80
 service "nginx" exposed
@@ -53,7 +53,6 @@ svc/nginx                   10.100.0.16   <none>        80/TCP     33s
 
 NAME                        READY         STATUS        RESTARTS   AGE
 po/nginx-701339712-e0qfq    1/1           Running       0          35s
-po/nginx-701339712-o00ef    1/1           Running       0          35s
 ```