message: docs(core): remove experimental tag
  Remove experimental note on APP_INITIALIZER.
  PR Close
diff: @@ -13,14 +13,11 @@ import {Inject, Injectable, InjectionToken, Optional} from './di';
  /**
  * A function that will be executed when an application is initialized.
  - * @experimental
  */
  export const APP_INITIALIZER = new InjectionToken<Array<() => void>>('Application Initializer');
  /**
  * A class that reflects the state of running {@link APP_INITIALIZER}s.
  - *
  - * @experimental
  */
  @Injectable()
  export class ApplicationInitStatus {
  