Remove the semicolons from the JSON examples

[BronsonQuick]

Description

I was working through the "Supports" documentation and realised there are some semicolons in the JSON examples. It's best if we remove these so if people are copy and pasting anything into their JSON files it'll work as expected and they don't need to remove the semicolons manually to get webpack to build assets successfully.

How has this been tested?

I've copied and pasted these into my block.json file and webpack has compiled them successfully.

I was running Chassis locally with npm run start so that webpack would build my assets.

Screenshots

Types of changes

This simply updates the documentation in the Developer Handbook for the "Supports" section in the Block API Reference section.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• [] My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[github-actions]

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[aristath]

Thank you for the fix @BronsonQuick!

The failing tests are not related to this PR so I'll go ahead and merge it since it's a simple docs change 👍