New translation: /mdx/plugins.md

[arthurbarroso]

Qual o objetivo dessa pull request?

• Adição de uma nova tradução
• Correção em uma tradução existente

Qual arquivo foi traduzido/corrigido?

docs/mdx/plugins.md

[henriquepw]

🎉 Obrigado pela tradução @arthurbarroso,

teve só uma palavrinha que adicionasse um "t" a mais.

[henriquepw]

Aprovado!

[iaurg]

Ótima tradução, apenas um detalhe de letra.

[gatsbot]

Holy buckets, @arthurbarroso — we just merged your PR to Gatsby! 💪💜

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