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docs: modify the descendant spelling and remove multiple times parent's word (#27886) 

PR Close #27886
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nchetankumar 2019-01-02 11:48:33 +05:30 committed by Ben Lesh
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aio/content/guide/dependency-injection.md
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@ -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`.