message: docs: add missing '@usageNotes' tag to documentation
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diff: @@ -37,6 +37,7 @@ export const formDirectiveProvider: any = {
  * @see [Reactive Forms Guide](guide/reactive-forms)
  * @see `AbstractControl`
  *
  + * @usageNotes
  * ### Register Form Group
  *
  * The following example registers a `FormGroup` with first name and last name controls,
  