p5.image docs typo fix

[processprocess]

Changes:
"one applied to an image object" to "once applied to an image object"

For this page.

PR Checklist

n/a

[welcome]

🎉 Thanks for opening this pull request! Please check out our contributing guidelines if you haven't already. And be sure to add yourself to the list of contributors on the readme page!

[limzykenneth]

Hi @processprocess, is it possible to revert the changes in .allcontributors in this PR? We have a bot to handle adding new contributors to the list and we can use it to add you to it automatically, in addition there's a formatting error in the file in this PR. Thanks!

[processprocess]

Done! Thank you for your review :)
My bad, I was confused by the welcome bot line.

And be sure to add yourself to the list of contributors on the readme page!

[limzykenneth]

Looks good. Thanks!

@all-contributors please add @processprocess for docs

[allcontributors]

@limzykenneth

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

[processprocess]

I ❤️ p5