Add detailed description. Add new test.

mmv1/products/filestore/Instance.yaml

@@ -41,6 +41,12 @@ examples:
     primary_resource_id: 'instance'
     vars:
       instance_name: 'test-instance'
+  - !ruby/object:Provider::Terraform::Examples
+    name: 'filestore_instance_protocol'
+    primary_resource_id: 'instance'
+    min_version: beta
+    vars:
+      instance_name: 'test-instance'
   - !ruby/object:Provider::Terraform::Examples
     name: 'filestore_instance_enterprise'
     primary_resource_id: 'instance'
@@ -102,8 +108,12 @@ properties:
     name: 'protocol'
     description: |
       Either NFSv3, for using NFS version 3 as file sharing protocol,
-      or NFSv4.1, for using NFS version 4.1 as file sharing protocol. The default is NFSv3.
+      or NFSv4.1, for using NFS version 4.1 as file sharing protocol. 
+      NFSv4.1 can be used with HIGH_SCALE_SSD, ZONAL, REGIONAL and ENTERPRISE.
+      The default is NFSv3.
     default_value: :NFS_V3
+    min_version: 'beta'
+    immutable: true
     values:
       - :NFS_V3
       - :NFS_V4_1

mmv1/templates/terraform/examples/filestore_instance_protocol.tf.erb

@@ -0,0 +1,18 @@
+resource "google_filestore_instance" "<%= ctx[:primary_resource_id] %>" {
+  provider = google-beta
+  name     = "<%= ctx[:vars]["instance_name"] %>"
+  location = "us-central1"
+  tier     = "ENTERPRISE"
+  protocol = "NFS_V4_1"
+
+  file_shares {
+    capacity_gb = 1024
+    name        = "share1"
+  }
+
+  networks {
+    network = "default"
+    modes   = ["MODE_IPV4"]
+  }
+
+}