message: add some comment on DnsValidatedCertificate issue
diff: @@ -36,6 +36,10 @@ class TheBasicMQStack(core.Stack):
  hosted_zone_id=hosted_zone_id,
  zone_name=zone_name)
  + # You may use acm.DnsValidatedCertificate to automate certificate provision.
  + # However, be careful of ACM yearly certificate limit.
  + # You will bump into the error after you destroy/deploy the stack over and over again.
  + # See https://github.com/aws/aws-cdk/issues/5889 for the details.
  cert = acm.Certificate.from_certificate_arn(self, 'cert', certificate_arn=cert_arn)
  # MQ needs to be setup in a VPC
  