Fix example of kubectl config set-credentials

Author: int128

staging/src/k8s.io/kubectl/pkg/cmd/config/create_authinfo.go

@@ -104,7 +104,7 @@ var (
 		kubectl config set-credentials cluster-admin --auth-provider=oidc --auth-provider-arg=client-secret-
 
 		# Enable new exec auth plugin for the "cluster-admin" entry
-		kubectl config set-credentials cluster-admin --exec-command=/path/to/the/executable --exec-api-version=client.authentication.k8s.io/v1beta
+		kubectl config set-credentials cluster-admin --exec-command=/path/to/the/executable --exec-api-version=client.authentication.k8s.io/v1beta1
 
 		# Define new exec auth plugin args for the "cluster-admin" entry
 		kubectl config set-credentials cluster-admin --exec-arg=arg1 --exec-arg=arg2