Merge pull request #27417 from joostas/docker-cli-kubectl-zh

[zh] Fix label selector in "kubectl for Docker Users"

Author: k8s-ci-robot

content/zh/docs/reference/kubectl/docker-cli-to-kubectl.md

@@ -371,7 +371,7 @@ nginx-app   1         1         1            1           2m
 ```
 
 ```shell
-kubectl get po -l run=nginx-app
+kubectl get po -l app=nginx-app
 ```
 ```
 NAME                         READY     STATUS    RESTARTS   AGE
@@ -385,7 +385,7 @@ deployment "nginx-app" deleted
 ```
 
 ```shell
-kubectl get po -l run=nginx-app
+kubectl get po -l app=nginx-app
 # Return nothing
 ```