chore(docs): add undocumented attributes

Author: nicolai86

docs/r/compute_backend_service.html.markdown

@@ -73,6 +73,9 @@ The following arguments are supported:
     for checking the health of the backend service. Currently at most one health
     check can be specified, and a health check is required.
 
+* `region` - (Optional) The region this backend service has been created in. If
+    unspecified, this defaults to the region configured in the provider.
+
 - - -
 
 * `backend` - (Optional) The list of backends that serve this BackendService. Structure is documented below.

docs/r/compute_disk.html.markdown

@@ -66,6 +66,8 @@ exported:
 
 * `self_link` - The URI of the created resource.
 
+* `users` - (Computed) The Users of the created resource.
+
 ## Import
 
 Disks can be imported using the `name`, e.g.

docs/r/compute_global_forwarding_rule.html.markdown

@@ -75,6 +75,9 @@ The following arguments are supported:
 
 * `target` - (Required) URL of target HTTP or HTTPS proxy.
 
+* `region` - (Optional) The region this resource has been created in. If
+    unspecified, this defaults to the region configured in the provider.
+
 - - -
 
 * `description` - (Optional) Textual description field.

docs/r/compute_target_http_proxy.html.markdown

@@ -72,6 +72,9 @@ The following arguments are supported:
 * `url_map` - (Required) The URL of a URL Map resource that defines the mapping
     from the URL to the BackendService.
 
+* `project` - (Optional) The project in which the resource belongs. If it
+    is not provided, the provider project is used.
+
 - - -
 
 * `description` - (Optional) A description of this resource. Changing this

docs/r/storage_bucket_acl.html.markdown

@@ -43,6 +43,8 @@ resource "google_storage_bucket_acl" "image-store-acl" {
 
 * `role_entity` - (Optional) List of role/entity pairs in the form `ROLE:entity`. See [GCS Bucket ACL documentation](https://cloud.google.com/storage/docs/json_api/v1/bucketAccessControls)  for more details. Must be set if `predefined_acl` is not.
 
+* `default_acl` - (Optional) Configure this ACL to be the default ACL.
+
 ## Attributes Reference
 
 Only the arguments listed above are exposed as attributes.