Add project log sink example to documentation

[nbrys]

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Description

Since April 2023 GCP support a log sink into a different project for logging_project_sink. According to https://github.com/hashicorp/terraform-provider-google/issues/13972 no validation is done on the input for the destination field, but the documentation about this resource should be updated

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/logging_project_sink#destination

New or Affected Resource(s)

logging_project_sink

Potential Terraform Configuration

References

b/312432861

[nbrys]

Can be a Cloud Storage bucket, a PubSub topic, a BigQuery dataset or a Cloud Logging bucket

->

Can be a Cloud Storage bucket, a PubSub topic, a BigQuery dataset, another GCP Project or a Cloud Logging bucket

[rileykarson]

@roaks3 I'm assuming this didn't trigger the service label robot because the google_ prefix wasn't present on the resources- does that sound right?