[DOCS] for sample:

É chato estudar isso e amanhã a google mudar a sintaxe das libs e eu ter que estudar tudo novamente, acho melhor repensar sobre a cultura das empresas que geram minhas ferramentas.

The issue names no file, sample, test, or entry point. First clarify which Firebase or JavaScript sample and syntax change is being requested; then identify the affected documentation and define what updated guidance would count as done.

Written by the indexing model from the issue text.