fix typo in faq (fixes #3567)

[tuyisabeangelique]

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Description, Screenshots and/or Screencast

fixes #3567

Raw.Githack Preview Link

https://raw.githack.com/tuyisabeangelique/tuyisabeangelique.github.io/3567-faq-fix-typo/index.html#!pages/vi/vi-faq.md

[RheuX]

the fixes looks great, just some weird duplicates issues

[RheuX]

i think this is supposed to be for the other pull request? #3570

[jessewashburn]

See my comment on #3570