Update cosmos-db.json to add type to operation (#25905)

Author: vchske

specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2023-09-15-preview/cosmos-db.json

@@ -11053,6 +11053,7 @@
         },
         "display": {
           "description": "The object that represents the operation.",
+          "type": "object",
           "properties": {
             "Provider": {
               "description": "Service provider: Microsoft.ResourceProvider",