i18n(zh-cn): Update index.mdx

[Nin3lee]

Description

• Note: This file is up to date! I didn't change anything visual. I deleted a duplicated blank line to make the Translation Status change.

Why I need to do this:

• Add <LinkButton> component #1784 (trigger the translation status in index.mdx outdated)
• [i18nIgnore] docs: update index.mdx hero action buttons variants #2233 (actually update the index.mdx)

[changeset-bot]

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Latest commit: 6411d27

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[HiDeoo]

Thanks for handling this case 👍