model validation fix

Author: sudeepmsft

specification/deviceprovisioningservices/resource-manager/Microsoft.Devices/stable/2020-01-01/examples/DPSCreate.json

@@ -3,7 +3,7 @@
     "provisioningServiceName": "myFirstProvisioningService",
     "resourceGroupName": "myResourceGroup",
     "api-version": "2020-01-01",
-    "subscriptionid": "91d12660-3dec-467a-be2a-213b5544ddc0",
+    "subscriptionId": "91d12660-3dec-467a-be2a-213b5544ddc0",
     "iotDpsDescription": {
       "location": "East US",
       "properties": {},
@@ -20,7 +20,7 @@
         "etag": "AAAAAAAADGk=",
         "name": "myFirstProvisioningService",
         "resourcegroup": "myResourceGroup",
-        "subscriptionId": "91d12660-3dec-467a-be2a-213b5544ddc0",
+        "subscriptionid": "91d12660-3dec-467a-be2a-213b5544ddc0",
         "location": "eastus",
         "properties": {
           "state": "Active",