add enumValueLabels, property subtext, and machine type extension in …

…WordPress example (#74)

* add enumValueLabels and property subtext examples to wordpress tf example

* add machine prop extension

* change to standard yaml object/array format

examples/terraform/wordpress/metadata.display.yaml

@@ -93,12 +93,15 @@ spec:
         install_phpmyadmin:
           name: install_phpmyadmin
           title: Install phpMyAdmin
+          subtext: phpMyAdmin is an open source tool to administer MySQL databases with the use of a web browser.
         machine_type:
           name: machine_type
           title: Machine type
           xGoogleProperty:
             type: ET_GCE_MACHINE_TYPE
             zoneProperty: zone
+            gceMachineType:
+              diskImageProperty: source_image
         networks:
           name: networks
           title: Network name
@@ -117,6 +120,11 @@ spec:
         source_image:
           name: source_image
           title: Source Image
+          enumValueLabels:
+            - label: wordpress-v20220821
+              value: projects/click-to-deploy-images/global/images/wordpress-v20220821
+            - label: wordpress-123
+              value: projects/click-to-deploy-images/global/images/wordpress-123
           xGoogleProperty:
             type: ET_GCE_DISK_IMAGE
         sub_networks: