[Docs][Checkbox]: outdated documentation for Checkbox component

[fluoxe7ine]

🐛 Bug report

Checkbox is built from four parts: root, label, control and indicator. However, "indicator" part is not mentioned at all in the docs.

💥 Steps to reproduce

1. Go to https://zagjs.com/components/react/checkbox
2. Check that docs page doesn't consist any info about "indicator" part.

🧐 Expected behavior

Documentation for checkbox component consists information about "indicator" part, correct visualization image, usage examples etc.

📝 Additional information

This issue is also related in Ark UI documentation too. Wrong anatomy visualization and no info about "indicator" part.