message: docs: add link to Angular component/material changelog.
  At present, users don't have an easy way to discover what
  deprecations occurred for Angular CDK or Angular Material.
  This change adds a link to the changelog to the deprecations.md
  file.
  PR Close
diff: @@ -62,8 +62,7 @@ v9 - v12
  | template syntax | [`/deep/`, `>>>`, and `::ng-deep`](#deep-component-style-selector) | <!--v7--> unspecified |
  | browser support | [`IE 9 and 10, IE mobile`](#ie-9-10-and-mobile) | <!--v10--> v11 |
  -
  -
  +For information about Angular CDK and Angular Material deprecations, see the [changelog](https://github.com/angular/components/blob/master/CHANGELOG.md).
  ## Deprecated APIs
  