feat(docs): Add documentation & example that AsyncApi 3 is supported

[Lazzaretti]

trafficstars

Hey, I just made a Pull Request!

Add documentation & example that AsyncApi 3 is supported. The same way as it is done with OpenApi.

I also updated the example to the new version.

fixes #22534

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [x] Added or updated documentation
• [ ] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage/catalog-model

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/catalog-model	packages/catalog-model	none	v1.4.4-next.0
@backstage/plugin-api-docs	plugins/api-docs	patch	v0.10.4-next.2

[github-actions[bot]]

Uffizzi Cluster pr-22536 was deleted.

[backstage-goalie[bot]]

Thanks for the contribution! All commits need to be DCO signed before they are reviewed. Please refer to the the DCO section in CONTRIBUTING.md or the DCO status for more info.

[github-actions[bot]]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[github-actions[bot]]

Thank you for contributing to Backstage! The changes in this pull request will be part of the 1.23.0 release, scheduled for Tue, 20 Feb 2024.

[awanlin]

Thanks again for this @Lazzaretti and looks like the demo site is now up to date too! 🚀 https://demo.backstage.io/catalog/default/api/streetlights/definition

Thanks for the review and merge @Rugvip 👍