message: docs: revise text for adding async validators to template-driven forms
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diff: @@ -341,7 +341,9 @@ In reactive forms, add an async validator by passing the function directly to th
  ### Adding async validators to template-driven forms
  -To use an async validator in template-driven forms, register it with the `NG_ASYNC_VALIDATORS` provider.
  +To use an async validator in template-driven forms, create a new directive and register the `NG_ASYNC_VALIDATORS` provider on it.
  +
  +In the example below, the directive injects the `UniqueAlterEgoValidator` class that contains the actual validation logic and invokes it in the `validate` function, triggered by Angular when validation should happen.
  <code-example path="form-validation/src/app/shared/alter-ego.directive.ts" region="async-validator-directive"></code-example>
  