i18n(pt-BR): update astro-syntax.mdx

[viniciusdeliz]

Description (required)

Update and review i18n/pt-br/basics/astro-syntax.mdx file

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Locale	File	Note
pt-br	basics/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.