Interactivity API: Variable name correction in the documentation

[steveariss]

What?

Minor correction to a variable name referenced in a code snippet on the interactivity api documentation

Why?

The current code snippet in the documentation is incorrect. wp_interactivity_process_directives() is being passed an undefined value

How?

Testing Instructions

N/A

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Unlinked Accounts

The following contributors have not linked their GitHub and WordPress.org accounts: @steveariss.

Contributors, please read how to link your accounts to ensure your work is properly credited in WordPress releases.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Unlinked contributors: steveariss.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @steveariss! In case you missed it, we'd love to have you join us in our Slack community.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[DAreRodz]

Nice catch! Thank you @steveariss. 🙏