Update block-registration.md

[sha-linimoorthy]

Comma is missing after JSON property issue #1397

What?

This pull request addresses the missing comma after a JSON property in relation to issue #1397.

Why?

The missing comma in the JSON property causes an issue in [provide brief context here]. This PR adds the necessary commas to resolve the problem.

How?

I have modified the affected code to include the missing commas in the JSON properties.

Testing Instructions

1. Open a post or page.
2. Insert a heading block.
3. [Add any additional testing steps if necessary.]

Testing Instructions for Keyboard

Screenshots or Screencast

[github-actions]

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[github-actions]

Warning: Type of PR label mismatch

To merge this PR, it requires exactly 1 label indicating the type of PR. Other labels are optional and not being checked here.

• Type-related labels to choose from: [Type] Automated Testing, [Type] Breaking Change, [Type] Bug, [Type] Build Tooling, [Type] Code Quality, [Type] Copy, [Type] Developer Documentation, [Type] Enhancement, [Type] Experimental, [Type] Feature, [Type] New API, [Type] Task, [Type] Performance, [Type] Project Management, [Type] Regression, [Type] Security, [Type] WP Core Ticket, Backport from WordPress Core.
• Labels found: .

Read more about Type labels in Gutenberg. Don't worry if you don't have the required permissions to add labels; the PR reviewer should be able to help with the task.

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @sha-linimoorthy! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[skorasaurus]

Thanks for your contribution; however this has already been fixed in #57248 ; rendering this pull request unnecessary.