docs: S2 Colors search

[reidbarber]

Adds Colors to the search menu.

Open to feedback on if/how we want this implemented. IMO its a good addition to the "Resources" section of the search menu. We could also possibly link to the style macro docs here too.

✅ Pull Request Checklist:

• [ ] Included link to corresponding React Spectrum GitHub Issue.
• [ ] Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• [ ] Filled out test instructions.
• [ ] Updated documentation (if it already exists for this component).
• [ ] Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project: