message: Fix example in DefaultPropertyCategoryOverride doc page
diff: @@ -23,9 +23,9 @@ Name | Required? | Type | Default | Meaning
  "ruleType": "DefaultPropertyCategoryOverride",
  "priority": 9999,
  "onlyIfNotHandled": true,
  - "specification": [{
  + "specification": {
  "id": "default",
  - "label": "General Properties",
  - }],
  + "label": "General Properties"
  + }
  }
  ```
  