Align with other cli descriptions

cmd/kubeadm/app/cmd/cmd.go

@@ -29,7 +29,7 @@ import (
 func NewKubeadmCommand(f cmdutil.Factory, in io.Reader, out, err io.Writer) *cobra.Command {
 	cmds := &cobra.Command{
 		Use:   "kubeadm",
-		Short: "kubeadm: easily bootstrap a secure Kubernetes cluster.",
+		Short: "kubeadm: easily bootstrap a secure Kubernetes cluster",
 		Long: dedent.Dedent(`
 			kubeadm: easily bootstrap a secure Kubernetes cluster.
 

cmd/kubeadm/app/cmd/init.go

@@ -66,7 +66,7 @@ func NewCmdInit(out io.Writer) *cobra.Command {
 	var skipPreFlight bool
 	cmd := &cobra.Command{
 		Use:   "init",
-		Short: "Run this in order to set up the Kubernetes master.",
+		Short: "Run this in order to set up the Kubernetes master",
 		Run: func(cmd *cobra.Command, args []string) {
 			i, err := NewInit(cfgPath, cfg, skipPreFlight)
 			kubeadmutil.CheckErr(err)

cmd/kubeadm/app/cmd/join.go

@@ -50,7 +50,7 @@ func NewCmdJoin(out io.Writer) *cobra.Command {
 	var cfgPath string
 	cmd := &cobra.Command{
 		Use:   "join",
-		Short: "Run this on any machine you wish to join an existing cluster.",
+		Short: "Run this on any machine you wish to join an existing cluster",
 		Run: func(cmd *cobra.Command, args []string) {
 			j, err := NewJoin(cfgPath, args, cfg, skipPreFlight)
 			kubeadmutil.CheckErr(err)