message: docs: fix dependecy injection documentation page typos
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diff: @@ -25,7 +25,7 @@ The next step is to make it available in the DI by providing it. A dependency c
  <code-example language="typescript">
  @Component({
  - selector: 'hero-list,
  + selector: 'hero-list',
  template: '...',
  providers: [HeroService]
  })
  