docs: remove angular.io from changelog (#16723)

CHANGELOG.md

@@ -2,25 +2,9 @@
 # [4.2.0-beta.1](https://github.com/angular/angular/compare/4.2.0-beta.0...4.2.0-beta.1) (2017-05-10)
 
 
-### Bug Fixes
-
-* **aio:** constrain header-link styles ([03513e9](https://github.com/angular/angular/commit/03513e9)), closes [#16573](https://github.com/angular/angular/issues/16573)
-* **aio:** do not display a Toc initially ([b9ed97c](https://github.com/angular/angular/commit/b9ed97c)), closes [#16597](https://github.com/angular/angular/issues/16597)
-* **aio:** do not nav to an image url ([2848f04](https://github.com/angular/angular/commit/2848f04)), closes [#16608](https://github.com/angular/angular/issues/16608)
-* **aio:** do not route `eplnkr` URLs to / from ServiceWorker ([b7caa3e](https://github.com/angular/angular/commit/b7caa3e))
-
-
 ### Features
 
 * add .ngsummary.ts files to support AOT unit tests ([547c363](https://github.com/angular/angular/commit/547c363))
-* **aio:** add helper CSS classes to the `aio-shell` for fine grained styling ([309ada5](https://github.com/angular/angular/commit/309ada5)), closes [#16549](https://github.com/angular/angular/issues/16549)
-* **aio:** api label styles ([d27588b](https://github.com/angular/angular/commit/d27588b))
-* **aio:** close sidenav in narrow (mobile) mode when select a new document ([#16617](https://github.com/angular/angular/issues/16617)) ([3887d8a](https://github.com/angular/angular/commit/3887d8a)), closes [#16603](https://github.com/angular/angular/issues/16603)
-* **aio:** focus search when `/` is pressed ([#16636](https://github.com/angular/angular/issues/16636)) ([041f57c](https://github.com/angular/angular/commit/041f57c)), closes [#16129](https://github.com/angular/angular/issues/16129)
-* **aio:** scroll back to top when TOC more-items clicked to close ([98d83b2](https://github.com/angular/angular/commit/98d83b2)), closes [#16482](https://github.com/angular/angular/issues/16482)
-* **aio:** scrolling tweaks per 16619 ([#16660](https://github.com/angular/angular/issues/16660)) ([73505e2](https://github.com/angular/angular/commit/73505e2))
-* **aio:** should not send in-page navigations to Google Analytics ([3e33482](https://github.com/angular/angular/commit/3e33482)), closes [#16521](https://github.com/angular/angular/issues/16521)
-* **aio:** TOC float right + service refactor ([799be9c](https://github.com/angular/angular/commit/799be9c))