Update why-rtk-is-redux-today.md

[muyangren918]

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name: 📖 New/Updated Documentation Content
about: Updating legacy hand-written Redux usage sample to make it match Redux Toolkit version when dealing with id in todoToggled function

PR Type

Updated an existing page

Checklist

• Is there an existing issue for this PR?
  Yes, issue link: issues/4718
• Have the files been linted and formatted?
  Yes

What docs page is being added or updated?

• Section: What Does the Redux Core Do
• Page: https://redux.js.org/introduction/why-rtk-is-redux-today

For Updating Existing Content

What updates should be made to the page?

• Remove the curly braces in todoToggled function
• Change action.payload.id to action.payload in todosReducer function

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

No

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[timdorr]

Thanks!