[Website] Add support for Google Cloud Bigtable replication. (#2289)

Author: rileykarson

website/docs/r/bigtable_instance.html.markdown

@@ -31,34 +31,29 @@ resource "google_bigtable_instance" "instance" {
 
 The following arguments are supported:
 
-* `name` - (Required) The name of the Cloud Bigtable instance.
+* `name` - (Required) The name (also called Instance Id in the Cloud Console) of the Cloud Bigtable instance.
 
-* `instance_type` - (Optional) The instance type to create. One of `"DEVELOPMENT"` or `"PRODUCTION"`. Defaults to `"PRODUCTION"`.
+* `cluster` - (Required) A block of cluster configuration options. This can be specified 1 or 2 times. See structure below.
+
+-----
 
 * `project` - (Optional) The ID of the project in which the resource belongs. If it
     is not provided, the provider project is used.
 
-* `display_name` - (Optional) The human-readable display name of the Bigtable instance. Defaults to the instance `name`.
-
-* `cluster` - (Optional) A block of cluster configuration options. Either `cluster` or `cluster_id` must be used. Only one cluster may be specified. See structure below.
-
-* `cluster_id` - (Optional, Deprecated) The ID of the Cloud Bigtable cluster. Use `cluster.cluster_id` instead.
-
-* `zone` - (Optional, Deprecated) The zone to create the Cloud Bigtable cluster in. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations). Use `cluster.zone` instead.
+* `instance_type` - (Optional) The instance type to create. One of `"DEVELOPMENT"` or `"PRODUCTION"`. Defaults to `"PRODUCTION"`.
 
-* `num_nodes` - (Optional, Deprecated) The number of nodes in your Cloud Bigtable cluster. Minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance. Use `cluster.num_nodes` instead.
+* `display_name` - (Optional) The human-readable display name of the Bigtable instance. Defaults to the instance `name`.
 
-* `storage_type` - (Optional, Deprecated) The storage type to use. One of `"SSD"` or `"HDD"`. Defaults to `"SSD"`. Use `cluster.storage_type` instead.
 
 -----
 
-`cluster` supports the following arguments:
+The `cluster` block supports the following arguments:
 
 * `cluster_id` - (Required) The ID of the Cloud Bigtable cluster.
 
-* `zone` - (Optional) The zone to create the Cloud Bigtable cluster in. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations).
+* `zone` - (Required) The zone to create the Cloud Bigtable cluster in. Each cluster must have a different zone in the same region. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations).
 
-* `num_nodes` - (Optional) The number of nodes in your Cloud Bigtable cluster. Minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance.
+* `num_nodes` - (Optional) The number of nodes in your Cloud Bigtable cluster. Required, with a minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance.
 
 * `storage_type` - (Optional) The storage type to use. One of `"SSD"` or `"HDD"`. Defaults to `"SSD"`.