Update billingbenefits.json (Azure#21766)

Author: gaoyp830

specification/billingbenefits/resource-manager/Microsoft.BillingBenefits/stable/2022-11-01/billingbenefits.json

@@ -1134,13 +1134,14 @@
         "utilization": {
           "$ref": "#/definitions/Utilization"
         },
+        "renewSource": {
+          "$ref": "#/definitions/RenewSource"
+        },
+        "renewDestination": {
+          "$ref": "#/definitions/RenewDestination"
+        },
         "renewProperties": {
-          "type": "object",
-          "properties": {
-            "purchaseProperties": {
-              "$ref": "#/definitions/PurchaseRequest"
-            }
-          }
+          "$ref": "#/definitions/RenewProperties"
         }
       }
     },