Docs: Fix global viewports options example

[IanVS]

Closes #

What I did

I was confused when trying to use the new viewportStoryGlobals feature flag, because of a mistake in a couple of examples. This fixes it, using parameters.viewport.options instead of the older parameters.viewport.viewports.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

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• unit tests
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Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
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Greptile Summary

Updates documentation examples to correctly use parameters.viewport.options instead of parameters.viewport.viewports for configuring viewport presets in Storybook's preview configuration.

• Fixed viewport configuration in docs/_snippets/addon-viewport-options-in-preview.md to use correct options property
• Ensures consistency with viewport addon's actual implementation for INITIAL_VIEWPORTS assignment
• Improves clarity for users implementing the new viewportStoryGlobals feature flag

[greptile-apps]

LGTM

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[kylegach]

Thanks for catching and fixing this, Ian! Sorry for the confusion it must've caused.