message: Update account.json
  Updating the description of SystemData in the Collection.
diff: "description": "Gets or sets the parent collection reference."
  },
  "systemData": {
  - "description": "Gets the system data that contains information about who and when created and updated the resource.",
  + "description": "Metadata pertaining to creation and last modification of the resource.",
  "allOf": [
  {
  "$ref": "#/definitions/SystemData"
  