Update link for Redux Middleware Tutorial - Fix #4647

[lucasferrazlima]

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name: Update link for Redux Middleware Tutorial about: Fixing a broken link

Checklist

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

  • 4647

• [x] Have the files been linted and formatted?

What docs page needs to be fixed?

• Section: Learning Resources
• Page: https://redux.js.org/introduction/learning-resources#middleware

What is the problem?

The resource for Redux Middleware Tutorial is pointing to a broken link.

What changes does this PR make to fix the problem?

The original link has been replaced with a GitHub repository containing notes authored by the original writer of the article. This new link provides access to the same content that was initially available on the author's blog.

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[EskiMojo14]

thanks!