add tke node pool import instructions (#2577)

Author: bruceybian

tencentcloud/services/tke/resource_tc_kubernetes_node_pool.md

@@ -141,4 +141,12 @@ resource "tencentcloud_kubernetes_node_pool" "mynodepool" {
 
 }
 
+```
+
+Import
+
+tke node pool can be imported, e.g.
+
+```
+$ terraform import tencentcloud_kubernetes_node_pool.test cls-xxx#np-xxx
 ```

website/docs/r/kubernetes_node_pool.html.markdown

@@ -268,3 +268,11 @@ In addition to all arguments above, the following attributes are exported:
 * `status` - Status of the node pool.
 
 
+## Import
+
+tke node pool can be imported, e.g.
+
+```
+$ terraform import tencentcloud_kubernetes_node_pool.test cls-xxx#np-xxx
+```
+