Fix outdated link to "Do I have to put all my state into Redux?"

[jshoung]

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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?
  • link issue here
• Have the files been linted and formatted?

What is the problem?

• A change made to the section header in Remove outdated content in "Do I have to put all my state into Redux?" #4434 was not updated in other locations in the docs

What changes does this PR make to fix the problem?

• Updates the links to the new header

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[timdorr]

this.setState({ thanks: true })