[AzureStack] User Subscription: rename NewSubscription to SubscriptionDefinition (Azure#8257)

Author: rakku-ms

specification/azsadmin/resource-manager/user-subscriptions/Microsoft.Subscriptions/preview/2015-11-01/Subscriptions.json

@@ -91,7 +91,7 @@
             "$ref": "#/parameters/SubscriptionIdParameter"
           },
           {
-            "$ref": "#/parameters/NewSubscriptionParameter"
+            "$ref": "#/parameters/SubscriptionDefinitionParameter"
           },
           {
             "$ref": "#/parameters/ApiVersionParameter"
@@ -263,9 +263,9 @@
       "description": "Id of the subscription.",
       "x-ms-parameter-location": "method"
     },
-    "NewSubscriptionParameter": {
+    "SubscriptionDefinitionParameter": {
       "description": "Subscription parameter.",
-      "name": "newSubscription",
+      "name": "subscriptionDefinition",
       "in": "body",
       "schema": {
         "$ref": "#/definitions/Subscription"