message: docs: modify the descendant spelling and remove multiple times parent's word
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diff: @@ -182,8 +182,7 @@ Child modules and component injectors are independent of each other, and create
  Thanks to [injector inheritance](guide/hierarchical-dependency-injection),
  you can still inject application-wide services into these components.
  -A component's injector is a child of its parent component's injector,
  -and a descendent of its parent's parent's injector, and so on all the way back to the application's _root_ injector. Angular can inject a service provided by any injector in that lineage.
  +A component's injector is a child of its parent component's injector, and inherits from all ancestor injectors all the way back to the application's _root_ injector. Angular can inject a service provided by any injector in that lineage.
  For example, Angular can inject `HeroListComponent` with both the `HeroService` provided in `HeroComponent` and the `UserService` provided in `AppModule`.
  