message: docs: fix typo in hierarchical injectors file
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diff: @@ -1072,7 +1072,7 @@ the service becomes available only in the `VillainsListComponent` and its sub-co
  `VillainService` is a singleton with respect to `VillainsListComponent`
  because that is where it is declared. As long as `VillainsListComponent`
  does not get destroyed it will be the same instance of `VillainService`
  -but if there are multilple instances of `VillainsListComponent`, then each
  +but if there are multiple instances of `VillainsListComponent`, then each
  instance of `VillainsListComponent` will have its own instance of `VillainService`.
  