Update part-5-async-logic.md

[BonaventureCJ]

At the summary part of the document, where it is stated: "Loading state should usually be stored as an enum, like 'idle' | 'pending' | 'succeeded' | 'rejected'". It is important to realize that the example given wasn't a TypeScript enum, but TypeScript's union of string literals. The documentation should be updated to reflect this.

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name: 📝 Documentation Fix
about: Fixing a problem in an existing docs page

Checklist

• Is there an existing issue for this PR?
  • link issue here
• Have the files been linted and formatted?

What docs page needs to be fixed?

• Section: https://redux.js.org/tutorials/essentials/part-5-async-logic#what-youve-learned
• Page: https://redux.js.org/tutorials/essentials/part-5-async-logic

What is the problem?

'idle' | 'pending' | 'succeeded' | 'rejected' is not an enum but a union of string literals.

What changes does this PR make to fix the problem?

Updates the statement to become: "Loading state should usually be stored as a union of string literals, like 'idle' | 'pending' | 'succeeded' | 'rejected'"

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[timdorr]

Thanks!