Merge pull request #55516 from zjj2wry/config-unset

Automatic merge from submit-queue (batch tested with PRs 59158, 38320, 59059, 55516, 59357). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

add example for kubectl config unset, this will help user use

**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/kubectl/cmd/config/unset.go

@@ -35,11 +35,20 @@ type unsetOptions struct {
 	propertyName string
 }
 
-var unset_long = templates.LongDesc(`
+var (
+	unsetLong = templates.LongDesc(`
 	Unsets an individual value in a kubeconfig file
 
 	PROPERTY_NAME is a dot delimited name where each token represents either an attribute name or a map key.  Map keys may not contain dots.`)
 
+	unsetExample = templates.Examples(`
+		# Unset the current-context.
+		kubectl config unset current-context
+
+		# Unset namespace in foo context.
+		kubectl config unset contexts.foo.namespace`)
+)
+
 func NewCmdConfigUnset(out io.Writer, configAccess clientcmd.ConfigAccess) *cobra.Command {
 	options := &unsetOptions{configAccess: configAccess}
 
@@ -47,7 +56,8 @@ func NewCmdConfigUnset(out io.Writer, configAccess clientcmd.ConfigAccess) *cobr
 		Use: "unset PROPERTY_NAME",
 		DisableFlagsInUseLine: true,
 		Short:   i18n.T("Unsets an individual value in a kubeconfig file"),
-		Long:  unset_long,
+		Long:    unsetLong,
+		Example: unsetExample,
 		Run: func(cmd *cobra.Command, args []string) {
 			cmdutil.CheckErr(options.complete(cmd, args))
 			cmdutil.CheckErr(options.run(out))