Merge pull request #21571 from pjhwa/fix-21570

Fix issue with k8s.io/docs/reference/kubectl/overview/

content/en/docs/reference/kubectl/overview.md

@@ -424,7 +424,7 @@ kubectl hello
 hello world
 ```
 
-```
+```shell
 # we can "uninstall" a plugin, by simply removing it from our PATH
 sudo rm /usr/local/bin/kubectl-hello
 ```
@@ -442,7 +442,7 @@ The following kubectl-compatible plugins are available:
 /usr/local/bin/kubectl-foo
 /usr/local/bin/kubectl-bar
 ```
-```
+```shell
 # this command can also warn us about plugins that are
 # not executable, or that are overshadowed by other
 # plugins, for example