Bento doc

[nsolerieu]

Summary

Add the documentation guidelines for the bento component

Supporting resources (related issues, external links, etc):

• Figma file
• Bento doc issue

Reviewer checklist:

• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change
• Check spelling
• Check image hosting

[changeset-bot]

⚠️ No Changeset found

Latest commit: aa736ab

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[github-actions]

🟢 No design token changes found

[github-actions]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.