Fix: Wrapped ref in quotes in theme.json docs

[Piyush-Deshmukh]

What?

In how-to-guide theme.json, wrapped ref in Quotes

Why?

Closes #54537

How?

{
    "color": {
        "text": { "ref": "styles.color.background" }
    }
}

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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

[t-hamano]

LGTM 👍 Thanks for the PR!

[github-actions]

Congratulations on your first merged pull request, @Piyush-Deshmukh! 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!

[jeffpaul]

@Piyush-Deshmukh we're working on collecting folks to credit in the WordPress 6.4 release, but do not yet have your WordPress.org username to include. Would you mind confirming that here and/or adding your GitHub handle to your WordPress.org account as noted in the comment above?