docs: convert markdown anchors to kebab-case

[Harsh-Sahu43]

This PR converts markdown anchors and their internal references from camelCase to kebab-case to restore GitHub navigation behavior.

Changes are limited to anchor names and references only. No content or semantics were modified.

Fixes #1144

[github-actions]

Welcome to AsyncAPI. Thanks a lot for creating your first pull request. Please check out our contributors guide useful for opening a pull request.
Keep in mind there are also other channels you can use to interact with AsyncAPI community. For more details check out this issue.

[char0n]

Hi @Harsh-Sahu43,

Thanks a lot for the work! We're review the changes ASAP.

[Harsh-Sahu43]

Thanks a lot for the quick response, @char0n.
I’m happy to clarify any part of the change or make adjustments if needed. Looking forward to the review.

[derberg]

@Harsh-Sahu43 please also open a PR in the website (write it is just a draft for this PR) and edit https://github.com/asyncapi/website/blob/master/markdown/docs/reference/specification/v3.0.0.md with the new version you worked on (removed ## Table of Contents as in website it is built separately). I just want to make sure we don't have any special magic in website that will stop working because of this PR. You PR in website will get a preview link where you can go and see if right-hand side navigation works

[Harsh-Sahu43]

Thanks @derberg for the review and guidance.

I’ve opened a draft PR in asyncapi/website to validate the kebab-case anchor
changes against the website rendering. All markdown and MDX checks pass, and
the Netlify preview fails during Next.js prerendering with a runtime
ReferenceError (channelId is not defined), which appears unrelated to the
anchor updates or TOC removal.

If you think it would be helpful, I’m happy to investigate this website-side
issue further or assist in isolating it. Please let me know how you’d like me
to proceed.

[derberg]

changes in your draft pr in website are not the same as in this PR

logs

9:45:10 PM: ReferenceError: channelId is not defined
9:45:10 PM:     at h (.next/server/pages/docs/reference/specification/v3.0.0.js:1:47074)
9:45:10 PM:     at i (.next/server/pages/docs/reference/specification/v3.0.0.js:1:222376)
9:45:10 PM: Error occurred prerendering page "/docs/reference/specification/v3.0.0". Read more: https://nextjs.org/docs/messages/prerender-error
9:45:10 PM: ReferenceError: channelId is not defined

you made modification to {channelId} by removing \ escape char

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Harsh-Sahu43]

I have updated the PR to restore the escaped literal {channelId}. The anchor updates in this PR are now fully aligned with asyncapi/website#4738. A new Deploy Preview should reflect the fix once the build completes.

Please let me know if you would like any further adjustments.

[derberg]

@Harsh-Sahu43 please check your PR in website again, the preview is still not available