Adding object_id for OSType = Windows

When we build a Windows based VHD image, we need to specify object_id. However, object_id is very ambigous and not mentioned on this document. I add some explanation and how to get it.
cgoeller · Apr 19, 2017 · 47419e9 · 47419e9
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commit 47419e9
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diff --git a/website/source/docs/builders/azure-setup.html.md b/website/source/docs/builders/azure-setup.html.md
@@ -17,6 +17,8 @@ In order to build VMs in Azure Packer needs 6 configuration options to be specif
 
 - `client_secret` - service principal secret / password
 
+- `object_id` - service principal object id (OSType = Windows Only)
+
 - `resource_group_name` - name of the resource group where your VHD(s) will be stored
 
 - `storage_account` - name of the storage account where your VHD(s) will be stored
@@ -192,6 +194,12 @@ Get `client_secret`
 
 This cannot be retrieved. If you forgot this, you will have to delete and re-create your service principal and the associated permissions.
 
+Get `object_id` (OSTYpe=Windows only)
+
+```shell
+azure ad sp show -n CLIENT_ID
+```
+
 Get `resource_group_name`
 
 ```shell