message: docs(aio): change Stack Overflow link
diff: "title": "Help",
  "children": [
  {
  - "url": "http://stackoverflow.com/questions/tagged/angular2",
  + "url": "https://stackoverflow.com/questions/tagged/angular",
  "title": "Stack Overflow",
  "tooltip": "Stack Overflow: where the community answers your technical Angular questions."
  },
  