Fix typo in documentation: redux essentials

[davidsainez]

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name: :memo: 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:
• Page: Part 4: Using Redux Data

What is the problem?

initialState is an array of Post(defined in the same code block) not Posts

What changes does this PR make to fix the problem?

Reference the correct type name

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[EskiMojo14]

thanks!