docs(middleware-factory): Fix and improve typing

[kamilturek]

Issue number: #3556

Summary

Changes

This PR fixes middleware factory examples by changing invalid Callable return types to dict, and adds type annotations for other middleware arguments.

User experience

N/A

Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

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[boring-cyborg]

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[github-actions]

No related issues found. Please ensure there is an open issue related to this change to avoid significant delays or closure.

[leandrodamascena]

Hey @kamilturek, you were very quick to send this PR! I left some comments before merging 🚀

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[kamilturek]

Hey @leandrodamascena, thanks for reviewing the PR! I agree with your comments. I've just pushed an update.

[leandrodamascena]

APPROVED!! Thanks a lot @kamilturek!

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!