feat(compute): create sample for Disk Async Replication feature (#770)

* Added terraform-doc-sample for Async PD

* added async replication

* added parent tag

* fixed the region violation comments

---------

Co-authored-by: Katie McLaughlin <katie@glasnt.com>

compute/disk_async_replication/main.tf

@@ -0,0 +1,51 @@
+/**
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+# [START compute_disk_async_replication_parent_tag]
+# [START compute_disk_primary]
+resource "google_compute_disk" "primary_disk" {
+  name = "primary-disk"
+  type = "pd-ssd"
+  zone = "europe-west4-a"
+
+  physical_block_size_bytes = 4096
+}
+# [END compute_disk_primary]
+
+# [START compute_disk_secondary]
+resource "google_compute_disk" "secondary_disk" {
+  name = "secondary-disk"
+  type = "pd-ssd"
+  zone = "europe-west3-a"
+
+  async_primary_disk {
+    disk = google_compute_disk.primary_disk.id
+  }
+
+  physical_block_size_bytes = 4096
+}
+# [END compute_disk_secondary]
+
+
+# [START compute_disk_async_replication]
+resource "google_compute_disk_async_replication" "default" {
+  primary_disk = google_compute_disk.primary_disk.id
+  secondary_disk {
+    disk = google_compute_disk.secondary_disk.id
+  }
+}
+# [END compute_disk_async_replication]
+# [END compute_disk_async_replication_parent_tag]