message: docs(aio): remove an extraneous apostrophe
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diff: @@ -32,7 +32,7 @@ from the [The Tour of Heroes](tutorial/).
  </code-tabs>
  The `HeroesComponent` is the top-level heroes component.
  -It's only purpose is to display the `HeroListComponent`
  +Its only purpose is to display the `HeroListComponent`
  which displays a list of hero names.
  This version of the `HeroListComponent` gets its `heroes` from the `HEROES` array, an in-memory collection
  