waitUntilDBInstanceDeleted
suspend fun NeptuneClient.waitUntilDBInstanceDeleted(request: DescribeDbInstancesRequest = DescribeDbInstancesRequest { }): Outcome<DescribeDbInstancesResponse>
suspend fun NeptuneClient.waitUntilDBInstanceDeleted(block: DescribeDbInstancesRequest.Builder.() -> Unit): Outcome<DescribeDbInstancesResponse>