message: docs: add link to AbstractControlOptions reference
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diff: @@ -341,7 +341,7 @@ To use an async validator in reactive forms, begin by injecting the validator in
  Then, pass the validator function directly to the `FormControl` to apply it.
  -In the following example, the `validate` function of `UniqueAlterEgoValidator` is applied to `alterEgoControl` by passing it to the control's `asyncValidators` option and binding it to the instance of `UniqueAlterEgoValidator` that was injected into `HeroFormReactiveComponent`. The value of `asyncValidators` can be either a single async validator function, or an array of functions.
  +In the following example, the `validate` function of `UniqueAlterEgoValidator` is applied to `alterEgoControl` by passing it to the control's `asyncValidators` option and binding it to the instance of `UniqueAlterEgoValidator` that was injected into `HeroFormReactiveComponent`. The value of `asyncValidators` can be either a single async validator function, or an array of functions. To learn more about `FormControl` options, see the [AbstractControlOptions](/api/forms/AbstractControlOptions) API reference.
  <code-example path="form-validation/src/app/reactive/hero-form-reactive.component.2.ts" region="async-validator-usage"></code-example>
  