Update kubernetes_cluster surge_upgrade default (#1177)

Co-authored-by: Andrew Starr-Bochicchio <[email protected]>

docs/resources/kubernetes_cluster.md

@@ -147,7 +147,7 @@ The following arguments are supported:
 * `version` - (Required) The slug identifier for the version of Kubernetes used for the cluster. Use [doctl](https://github.com/digitalocean/doctl) to find the available versions `doctl kubernetes options versions`. (**Note:** A cluster may only be upgraded to newer versions in-place. If the version is decreased, a new resource will be created.)
 * `vpc_uuid` - (Optional) The ID of the VPC where the Kubernetes cluster will be located.
 * `auto_upgrade` - (Optional) A boolean value indicating whether the cluster will be automatically upgraded to new patch releases during its maintenance window.
-* `surge_upgrade` - (Optional) Enable/disable surge upgrades for a cluster. Default: false
+* `surge_upgrade` - (Optional) Enable/disable surge upgrades for a cluster. Default: true
 * `ha` - (Optional) Enable/disable the high availability control plane for a cluster. Once enabled for a cluster, high availability cannot be disabled. Default: false
 * `registry_integration` - (optional) Enables or disables the DigitalOcean container registry integration for the cluster. This requires that a container registry has first been created for the account. Default: false
 * `node_pool` - (Required) A block representing the cluster's default node pool. Additional node pools may be added to the cluster using the `digitalocean_kubernetes_node_pool` resource. The following arguments may be specified: