i18n(pt-br): update astro-syntax.mdx translation

[cristhian-fs]

Description (required)

Update outdated translation of astro-syntax.mdx page.

Related issues & labels (optional)

• Closes #
• Suggested label: i18n

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pt-br/reference/astro-syntax.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.