kubeadm: grammatical fixes in join help

cmd/kubeadm/app/cmd/join.go

@@ -73,7 +73,7 @@ func NewCmdJoin(out io.Writer) *cobra.Command {
 		provide a file (a subset of the standard kubeconfig file). This file 
 		can be a local file or downloaded via an HTTPS URL. The forms are 
 		kubeadm join --discovery-token abcdef.1234567890abcdef 1.2.3.4:6443, 
-		kubeadm join --discovery-file path/to/file.conf or kubeadm join 
+		kubeadm join --discovery-file path/to/file.conf, or kubeadm join
 		--discovery-file https://url/file.conf. Only one form can be used. If 
 		the discovery information is loaded from a URL, HTTPS must be used and 
 		the host installed CA bundle is used to verify the connection.
@@ -85,9 +85,8 @@ func NewCmdJoin(out io.Writer) *cobra.Command {
 		approve these signing requests. This token is passed in with the 
 		--tls-bootstrap-token abcdef.1234567890abcdef flag.
 
-		Often times the same token is use for both parts. In this case, the 
-		--token flag can be used instead of specifying the each token 
-		individually.
+		Often times the same token is used for both parts. In this case, the
+		--token flag can be used instead of specifying each token individually.
 		`),
 		Run: func(cmd *cobra.Command, args []string) {
 			cfg.DiscoveryTokenAPIServers = args