Fix minor typo in HTTP guide (#2604)
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@ -155,7 +155,7 @@ block get-heroes-details
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*Observables* are a powerful way to manage asynchronous data flows.
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We'll learn about [Observables](#observables) later in this chapter.
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For *now* we get back on familiar ground by immediately by
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For *now* we get back on familiar ground by immediately
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converting that `Observable` to a `Promise` using the `toPromise` operator.
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+makeExcerpt('app/hero.service.ts', 'to-promise', '')
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