clarify specification of audit log types

[kujenga]

This change is intended to avoid the confusion outlined in
hashicorp/terraform-provider-google#5446,
which I also ran into. Having multiple audit logs in the example should
make it readily apparent how the resource is intended to be used.

Release Note Template for Downstream PRs (will be copied)

Improve documentation for multiple log_type values in google_project_iam_audit_config resource

[modular-magician]

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 1 file changed, 3 insertions(+))

[modular-magician]

Oops! It looks like you're using an unknown release-note type in your changelog entries:

• REPLACEME

Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[chrisst]

Thanks for clarifying!