Correct Vite config syntax in styling.mdx

[muhaimincs]

Fix syntax error in Vite configuration object.

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[Copilot]

Pull request overview

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Updates a code example in the styling guide, adjusting closing braces around a defineConfig snippet.

Changes:

• Modified the closing of the config example in styling.mdx.

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[ArmandPhilippot]

Nice catch, thank you!