Update log.js

[henry-hz]

I saw that the doc shows debugging level, but without explaining that it have dependency issues.

[mary-poppins]

Thanks for the PR!

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If you need to make changes to your pull request, you can update the commit with git commit --amend.
Then, update the pull request with git push -f.

Thanks again for your help!

[petebacondarwin]

Thanks. Landed with minor changes.