Add create tenant to CLI docs

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

cmd/flux/create_tenant.go

@@ -65,7 +65,6 @@ var (
 )
 
 func init() {
-	createTenantCmd.Hidden = true
 	createTenantCmd.Flags().StringSliceVar(&tenantNamespaces, "with-namespace", nil, "namespace belonging to this tenant")
 	createTenantCmd.Flags().StringVar(&tenantClusterRole, "cluster-role", "cluster-admin", "cluster role of the tenant role binding")
 	createCmd.AddCommand(createTenantCmd)