message: docs: mark the `entryComponents` array as deprecated
  The `entryComponents` array is now deprecated (per
  and https://angular.io/guide/deprecations#entryComponents).
  PR Close
diff: @@ -76,6 +76,12 @@ All router components must be entry components. Because this would require you t
  ## The `entryComponents` array
  +<div class="alert is-helpful">
  +
  +Since 9.0.0 with Ivy, the `entryComponents` property is no longer necessary. See [deprecations guide](guide/deprecations#entryComponents).
  +
  +</div>
  +
  Though the `@NgModule` decorator has an `entryComponents` array, most of the time
  you won't have to explicitly set any entry components because Angular adds components listed in `@NgModule.bootstrap` and those in route definitions to entry components automatically. Though these two mechanisms account for most entry components, if your app happens to bootstrap or dynamically load a component by type imperatively,
  you must add it to `entryComponents` explicitly.
  