Block attributes docs: minor documentation inconsistencies

[vasartam]

What?

Resolving minor documentation inconsistencies on Block Attributes page.

Why?

It becomes slightly harder to read when the content is not structured in the same way across the whole page.

How?

This PR resolves these issues.

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @vasartam! 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.

[vasartam]

Hey, can't seem to add a label. Maybe I've missed the appropriate UI on the PR creation stage.

Would be cool if someone could add a "[Type] Documentation" label.

Thanks.

[skorasaurus]

Thanks for your contribution; you didn't do anything wrong; as of now, only people that are a member of the Gutenberg team (if you make a few more contributions :)) can add labels.

[fabiankaegy]

Thanks for adding the consistency here :)

[github-actions]

Congratulations on your first merged pull request, @vasartam! We'd like to credit you for your contribution in the post announcing the next WordPress release, but we can't find a WordPress.org profile associated with your GitHub account. When you have a moment, visit the following URL and click "link your GitHub account" under "GitHub Username" to link your accounts:

https://profiles.wordpress.org/me/profile/edit/

And if you don't have a WordPress.org account, you can create one on this page:

https://login.wordpress.org/register

Kudos!

[skorasaurus]

Looks good, thanks for your patience @vasartam