fix: use defineEventHandler when definining middlewares

[EmmanuelDemey]

PR Checklist

Closes #

What is the new behavior?

I hope I understood well the documentation :D I found a typo about middlewares.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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[brandonroberts]

Thanks! @allcontributors add @EmmanuelDemey for doc