Fix redux-thunk imports in docs examples

[sinyakov]

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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?
  • no, but seems like trivial changes
• Have the files been linted and formatted?

What docs page needs to be fixed?

• https://redux.js.org/api/applymiddleware
• https://redux.js.org/api/compose
• https://redux.js.org/tutorials/fundamentals/part-6-async-logic
• https://redux.js.org/tutorials/fundamentals/part-8-modern-redux
• https://redux.js.org/usage/configuring-your-store
• https://redux.js.org/usage/migrating-to-modern-redux
• https://redux.js.org/usage/writing-logic-thunks

What is the problem?

Thunk middleware is imported as default in docs. Meanwhile [email protected] provides named exports.

What changes does this PR make to fix the problem?

Imports are fixed in docs and examples.

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[timdorr]

Thanks!