docs: update wpcs instructions to prevent errors

[nishantwrp]

Fixes

Fixes #[issue number] by @[issue author]

Description

Updates wpcs instructions to prevent error Getting PHPCS Response ERROR: Referenced sniff "PHPCSUtils" does not exist.

Technical details

Related to squizlabs/PHP_CodeSniffer#3110

Tests

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[nishantwrp]

@TimidRobot made this pr, as a replacement for #145.

[TimidRobot]

Thank you for catching this!

[brylie]

@all-contributors please add @nishantwrp for docs

[allcontributors]

@brylie

I've put up a pull request to add @nishantwrp! 🎉