Remove 'outline' from IconButton variants docs

[mperrotti]

Closes #

Changelog

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Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9778db9

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	105.74 KB (0%)
packages/react/dist/browser.umd.js	106.06 KB (0%)

[mperrotti]

I'm out Thursday 20 Feb through Tuesday 25 Feb. If this gets approved before I'm back, feel free to merge it.