Fix nat_ips syntax in example

[TheMagoo73]

Syntax in the previous version didn't work with Terraform 0.12. This update is based on discussion in #3980

[Chupaka]

Does this new syntax work with 0.11?

[TheMagoo73]

Good call; with the new splat syntax it won't work on 0.11 - the old entry was correct for that version.

[danawillow]

I believe this is no longer needed after GoogleCloudPlatform/magic-modules#2125, thanks though @TheMagoo73!

[ghost]

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