Updating items to remove additional properties

Author: mshimanshuchandel

specification/portal/resource-manager/Microsoft.Portal/preview/2020-09-01-preview/portal.json

@@ -530,11 +530,8 @@
         "parts": {
           "type": "array",
           "description": "The dashboard parts.",
-          "additionalProperties": {
-            "$ref": "#/definitions/DashboardParts"
-          },
           "items": {
-            "type": "object"
+            "$ref": "#/definitions/DashboardParts"
           }
         },
         "metadata": {
@@ -553,11 +550,8 @@
         "lenses": {
           "type": "array",
           "description": "The dashboard lenses.",
-          "additionalProperties": {
-            "$ref": "#/definitions/DashboardLens"
-          },
           "items": {
-            "type": "object"
+            "$ref": "#/definitions/DashboardLens"
           }
         },
         "metadata": {