ctr namespaces: improve usage string

kaijchen · kaijchen · commit 16d3f48a2e13 · 2021-09-21T12:26:29.000+08:00
Signed-off-by: Kaijie Chen &lt;chen@kaijie.org&gt;
diff --git a/cmd/ctr/commands/namespaces/namespaces.go b/cmd/ctr/commands/namespaces/namespaces.go
@@ -47,7 +47,7 @@ var createCommand = cli.Command{
 	Name:        "create",
 	Aliases:     []string{"c"},
 	Usage:       "create a new namespace",
-	ArgsUsage:   "<name> [<key>=<value]",
+	ArgsUsage:   "<name> [<key>=<value>]",
 	Description: "create a new namespace. it must be unique",
 	Action: func(context *cli.Context) error {
 		namespace, labels := commands.ObjectWithLabelArgs(context)
@@ -68,7 +68,7 @@ var setLabelsCommand = cli.Command{
 	Name:        "label",
 	Usage:       "set and clear labels for a namespace",
 	ArgsUsage:   "<name> [<key>=<value>, ...]",
-	Description: "set and clear labels for a namespace",
+	Description: "set and clear labels for a namespace. empty value clears the label",
 	Action: func(context *cli.Context) error {
 		namespace, labels := commands.ObjectWithLabelArgs(context)
 		if namespace == "" {
