Add beta release note in the helper text

docs/resources/loadbalancer.md

@@ -115,6 +115,12 @@ the backend service. Default value is `false`.
 * `droplet_ids` (Optional) - A list of the IDs of each droplet to be attached to the Load Balancer.
 * `droplet_tag` (Optional) - The name of a Droplet tag corresponding to Droplets to be assigned to the Load Balancer.
 * `firewall` (Optional) - A block containing rules for allowing/denying traffic to the Load Balancer. The `firewall` block is documented below. Only 1 firewall is allowed.
+* `domains` (Optional) - A list of `domains` required to ingress traffic to a Global Load Balancer. The `domains` block is documented below. 
+**NOTE**: this is a closed beta feature and not available for public use.
+* `glb_settings` (Optional) - A block containing `glb_settings` required to define target rules for a Global Load Balancer. The `glb_settings` block is documented below.
+**NOTE**: this is a closed beta feature and not available for public use.
+* `target_load_balancer_ids` (Optional) - A list of Load Balancer IDs to be attached behind a Global Load Balancer.
+**NOTE**: this is a closed beta feature and not available for public use.
 
 `forwarding_rule` supports the following:
 
@@ -148,6 +154,19 @@ the backend service. Default value is `false`.
 * `allow` - (Optional) A list of strings describing allow rules. Must be colon delimited strings of the form `{type}:{source}`
 * Ex. `deny = ["cidr:1.2.0.0/16", "ip:2.3.4.5"]` or `allow = ["ip:1.2.3.4", "cidr:2.3.4.0/24"]`
 
+`domains` supports the following:
+
+* `name` - (Required) The domain name to be used for ingressing traffic to a Global Load Balancer.
+* `is_managed` - (Optional) Control flag to specify whether the domain is managed by DigitalOcean.
+* `certificate_id` - (Optional) The certificate ID to be used for TLS handshaking.
+
+`glb_settings` supports the following:
+
+* `target_protocol` - (Required) The protocol used for traffic from the Load Balancer to the backend Droplets. The possible values are: `http` and `https`.
+* `target_port` - (Required) An integer representing the port on the backend Droplets to which the Load Balancer will send traffic. The possible values are: `80` for `http` and `443` for `https`.
+* `cdn` - (Optional) CDN configuration supporting the following:
+  * `is_enabled` - (Optional) Control flag to specify if caching is enabled.
+
 
 ## Attributes Reference