message: docs(forms): fix reactive-forms guide typo
  closes
diff: @@ -1134,7 +1134,7 @@ The reactive forms approach both emphasizes and facilitates this distinction.
  The default form displays a nameless hero with no addresses.
  You need a method to populate (or repopulate) the _secretLairs_ with actual hero addresses whenever
  -the parent `HeroListComponent` sets the `HeroListComponent.hero` input property to a new `Hero`.
  +the parent `HeroListComponent` sets the `HeroDetailComponent.hero` input property to a new `Hero`.
  The following `setAddresses` method replaces the _secretLairs_ `FormArray` with a new `FormArray`,
  initialized by an array of hero address `FormGroups`.
  