Fix default disk type in docs (#14096) (#10094)

[upstream:cf4c8b6f0d9d7133e33f5f17ea77d220663eb07f]

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

website/docs/r/container_cluster.html.markdown

@@ -871,7 +871,7 @@ The `master_authorized_networks_config.cidr_blocks` block supports:
     in GB. The smallest allowed disk size is 10GB. Defaults to 100GB.
 
 * `disk_type` - (Optional) Type of the disk attached to each node
-    (e.g. 'pd-standard', 'pd-balanced' or 'pd-ssd'). If unspecified, the default disk type is 'pd-standard'
+    (e.g. 'pd-standard', 'pd-balanced' or 'pd-ssd'). If unspecified, the default disk type is 'pd-balanced'
 
 * `enable_confidential_storage` - (Optional) Enabling Confidential Storage will create boot disk with confidential mode. It is disabled by default.