[📑 Docs]: Adapt Validate AsyncAPI documents guide for v3

[jonaslagoni]

For AsyncAPI v3, we need to adapt validate AsyncAPI documents guide (https://www.asyncapi.com/docs/guides/validate) to be usable with AsyncAPI v3.

I actually don't know what exactly is needed here, because I don't know whether the spectral rules in Spectral, will be adapted, or whether it will be part of the parser 🤔

[quetzalliwrites]

/good-first-issue area/docs

[asyncapi-bot]

Hey @alequetzalli, your message doesn't follow the requirements, you can try /help.

[github-actions]

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[derberg]

solved with #2303
in next major branch, but considered to be fixed and closing - also for easier management of the scope for v3