Update mongodb-setup.sh

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Fix typos in ArrayHelper guide [skip ci]

close #6349
docs/guide-ja/db-dao.md - prepared for translation [ci skip]
docs/guide-ja/db-dao.md - completed [ci skip]
Merge pull request #6350 from softark/docs-guide-ja-db-dao

docs/guide-ja/db-dao.md added [ci skip]