Remove CheckBox pad=none docs

[taysea]

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What does this PR do?

In v1 hpe-design-tokens, checkbox does not have pad built-in like previous theme versions. Removing unneeded docs.

Where should the reviewer start?

What testing has been done on this PR?

In addition to the feature you are implementing, have you checked the following:

General UX Checks

• [ ] Small, medium, and large screen sizes
• [ ] Cross-browsers (FireFox, Chrome, and Safari)
• [ ] Light & dark modes
• [ ] All hyperlinks route properly

Accessibility Checks

• [ ] Keyboard interactions
• [ ] Screen reader experience
• [ ] Run WAVE accessibility plugin (Chrome)

Code Quality Checks

• [ ] Console is free of warnings and errors
• [ ] Passes E2E commit checks
• [ ] Visual snapshots are reasonable

How should this be manually tested?

Any background context you want to provide?

What are the relevant issues?

Screenshots (if appropriate)

Should this PR be mentioned in Design System updates?

Is this change backwards compatible or is it a breaking change?

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 28c62d32385a85dd3218d13e57751d7c4c600fae

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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