Merge pull request GoogleCloudPlatform#4516 from rachit-google/update_storage_a3ultra

updated the storage for a3Ultra to basic ssd
updated the storage size

Author: rachit-google

examples/machine-learning/a3-ultragpu-8g/a3ultra-vm.yaml

@@ -87,8 +87,8 @@ deployment_groups:
     source: modules/file-system/filestore
     use: [a3ultra-net-0]
     settings:
-      filestore_tier: BASIC_HDD
-      size_gb: 10240
+      filestore_tier: BASIC_SSD
+      size_gb: 2560
       local_mount: /home
       reserved_ip_range: $(vars.filestore_ip_range)
     outputs: