docs(aio): remove services plurality (#20696)

remove services plurality for the sentence formation to be proper

PR Close #20696
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A7xSV 2017-11-30 01:13:54 +05:30 committed by Miško Hevery
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The Tour of Heroes `HeroesComponent` is currently getting and displaying fake data.
After the refactoring in this tutorial, `HeroesComponent` will be lean and focused on supporting the view.
It will also be easier to unit-test with a mock services.
It will also be easier to unit-test with a mock service.
## Why services