fix: typo in usage doc

[Joshua-Prakasam]

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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?
  • no
• [ ] Have the files been linted and formatted?
  • yes

What docs page needs to be fixed?

• Page: Usage with TypeScript (Section: Typing createAsyncThunk)
• Page: Writing Custom Middleware (Section: Create side effects for actions)

What is the problem?

Misspelled word whicher Misplaced space th eaction

What changes does this PR make to fix the problem?

Changes whicher to whichever Changes th eaction to the action

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[EskiMojo14]

thanks!