docs(validation-and-serialization): Fix example on query string coercion

[galiarmero]

Description

In query string coercion example, query param passed is ids. Thus, the resulting curl response should have ids param instead of hello.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[github-actions]

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