Update route53_health_check.html.markdown
Update route53_health_check.html.markdown

Adding exported id under the Attributes Reference. This appears to be undocumented behavior
kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws