Update ReadMe.md

[adelanre]

• Added Destination to log sink create.
• Add missing \ to the gcloud function deploy.
• Add LOG_EXPORT_NAME var

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[adelanre]

@googlebot I signed it!

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[tims]

LGTM

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.