feat(pie-docs): DSW-2497 add radio-group code page to docs

[jamieomaguire]

Describe your changes (can list changeset entries if preferable)

• Adds the code page for the radio-group component to the docs site

Author Checklist (complete before requesting a review)

• I have performed a self-review of my code
• I have added thorough tests where applicable (unit / component / visual)
• I have reviewed the PIE Storybook/PIE Docs PR preview
• I have reviewed visual test updates properly before approving

Reviewer checklists (complete before approving)

Reviewer 1 - @fernandofranca

• I have reviewed the PIE Storybook/PIE Docs PR preview
• If there are visual test updates, I have reviewed them

Reviewer 2 @raoufswe

• I have reviewed the PIE Storybook/PIE Docs PR preview
• If there are visual test updates, I have reviewed them

[changeset-bot]

⚠️ No Changeset found

Latest commit: ce3e33e

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