Closes #4672 Update combineReducers.md

[Twintails]

The Docs for Redux, in many places, cite moving to configureStore. Though createStore is still available, it is also marked as deprecated. This doc may need to update to reflect modern recommendations.

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name: :book: New/Updated Documentation Content about: Adding a new docs page, or updating content in an existing docs page

PR Type

Does this PR add a new page, or update an existing page? update an existing page

Checklist

• [x] Is there an existing issue for this PR?

  • 4672

• [ ] Have the files been linted and formatted?

What docs page is being added or updated?

• Section:
• Page: https://redux.js.org/api/combinereducers

at anchor https://redux.js.org/api/combinereducers#appjs code example

For Updating Existing Content

What updates should be made to the page?

lower adopter/developer confusion on the approach to Redux.

Do these updates change any of the assumptions or target audience? If so, how do they change?

This update makes a huge assumption in blending of the lines of ownership/documents of use and responsibilities between Redux and @reduxjs/toolkit

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[EskiMojo14]

thanks!

CI failures seem unrelated to this change.

it's also worth noting that configureStore often replaces the need for calling combineReducers, as it calls it automatically if passed an object as the reducer field.