feat(tke): [125902956] update node_os desc (#3455)

* update node_os desc

* update node_os desc

Author: hellertang

.changelog/3455.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_kubernetes_node_pool: update desc of `node_os`
+```

tencentcloud/services/tke/resource_tc_kubernetes_node_pool.go

@@ -357,7 +357,7 @@ The following arguments are supported:
 * `multi_zone_subnet_policy` - (Optional, String) Multi-availability zone/subnet policy. Valid values: PRIORITY and EQUALITY. Default value: PRIORITY.
 * `node_config` - (Optional, List) Node config.
 * `node_os_type` - (Optional, String) The image version of the node. Valida values are `DOCKER_CUSTOMIZE` and `GENERAL`. Default is `GENERAL`. This parameter will only affect new nodes, not including the existing nodes.
-* `node_os` - (Optional, String) Operating system of the cluster. Please refer to [TencentCloud Documentation](https://www.tencentcloud.com/document/product/457/46750?lang=en&pg=#list-of-public-images-supported-by-tke) for available values. Default is 'tlinux2.4x86_64'. This parameter will only affect new nodes, not including the existing nodes.
+* `node_os` - (Optional, String) Node pool operating system (enter the image ID for a custom image, and enter the OS name for a public image). If custom image, please refer to [TencentCloud Documentation](https://www.tencentcloud.com/document/product/457/46750?lang=en&pg=#list-of-public-images-supported-by-tke) for available values. Default is 'tlinux2.4x86_64'. This parameter will only affect new nodes, not including the existing nodes.
 * `retry_policy` - (Optional, String, ForceNew) Available values for retry policies include `IMMEDIATE_RETRY` and `INCREMENTAL_INTERVALS`.
 * `scale_tolerance` - (Optional, Int) Control how many expectations(`desired_capacity`) can be tolerated successfully. Unit is percentage, Default is `100`. Only can be set if `wait_node_ready` is `true`.
 * `scaling_group_name` - (Optional, String) Name of relative scaling group.