Update mmv1/third_party/terraform/website/docs/r/container_cluster.html.markdown

Co-authored-by: Riley Karson <[email protected]>

Author: zli82016

mmv1/third_party/terraform/website/docs/r/container_cluster.html.markdown

@@ -1427,7 +1427,7 @@ linux_node_config {
 
 * `cluster_dns` - (Optional) Which in-cluster DNS provider should be used. `PROVIDER_UNSPECIFIED` (default) or `PLATFORM_DEFAULT` or `CLOUD_DNS`.
 
-* `cluster_dns_scope` - (Optional) The scope of access to cluster DNS records. `DNS_SCOPE_UNSPECIFIED` or `CLUSTER_SCOPE` or `VPC_SCOPE`.
+* `cluster_dns_scope` - (Optional) The scope of access to cluster DNS records. `DNS_SCOPE_UNSPECIFIED`, `CLUSTER_SCOPE`, or `VPC_SCOPE`. If the `cluster_dns` field is set to `CLOUD_DNS`, `DNS_SCOPE_UNSPECIFIED` and empty/null behave like `CLUSTER_SCOPE`.
 
 * `cluster_dns_domain` - (Optional) The suffix used for all cluster service records.