Fixed cursor image issue

[haroon10725]

Fixed issue #6804

https://github.com/processing/p5.js/assets/104259212/890a427a-fea5-46e2-94de-a36f3a141a36

Hey @davepagurek, PR is ready for review. The only problem was that user did not know pixel size for image, that's why it was not rendering the cursor image. So I have updated the reference page of cursor.

Resolves #[Add issue number here]

Changes:

Screenshots of the change:

PR Checklist

• [x] npm run lint passes
• [x] Inline documentation is included / updated
• [x] Unit tests are included / updated

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[davepagurek]

@all-contributors please add haroon10725 for docs

[allcontributors[bot]]

@davepagurek

I've put up a pull request to add @haroon10725! :tada: