Update deployment-external-audit-monitor.md

[shigeooooooooooo]

even when usage is below the free tire. ---> even when usage is below the free tier.

I assume it is just a typo..

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[ttorble]

@Gargi-Sinha

Can you review the proposed changes?

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[v-dirichards]

@shigeooooooooooo geo The article has been substantially updated or deleted, and this change no longer applies. If you'd still like to update the article, please open a new PR. Or if you believe this PR was closed by mistake, email the PublicPRs alias.

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