[Prettier] Updated README.md file with the correct syntax

[amustaque97]

Fixes #34555. This commit is to update the readme file.

Description

In this PR I have updated the readme file of Prettier to have the correct syntax in the prettierrc file. Thus this PR doesn't require any code-level testing. It's a simple text change.

How has this been tested?

README.md file has been updated with correct syntax.

Screenshots

NA

Types of changes

Documentation Update

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).

cc @gziolo

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @amustaque97! 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.

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[talldan]

Great, thank you for this, and congrats on your first merged PR 🎉