add steps for setting up Google API access back

[ghost]

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[opbld32]

Docs Build status updates of commit 6d761ce:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Advertising/scripts/examples/authenticating-with-google-services.md	:white_check_mark:Succeeded

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[eric-urban]

@dennis-yemelyanov per our offline conversation I'll close your PR and merge a separate branch. Thanks!