Update iapi-about.md

[iamibrahimriaz]

Interactivity API About - Improved

What?

Spelling Mistake on docs/reference-guides/interactivity-api/iapi-about.md

How?

Fixed the spelling mistake

Screenshots or screencast

[github-actions]

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[github-actions]

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

[fabiankaegy]

Good catch :)