Add descriptions to all the outputs

outputs.tf

@@ -1,15 +1,19 @@
 output "hostname" {
-  value = "https://${var.hostname}/"
+  description = "The URL for the Website."
+  value       = "https://${var.hostname}/"
 }
 
 output "s3_bucket_name" {
-  value = "${aws_s3_bucket.content.id}"
+  description = "The name of the S3 bucket to upload the website content to."
+  value       = "${aws_s3_bucket.content.id}"
 }
 
 output "cloudfront_distribution_id" {
-  value = "${aws_cloudfront_distribution.website.id}"
+  description = "The ID of the CloudFront Distribution."
+  value       = "${aws_cloudfront_distribution.website.id}"
 }
 
 output "cloudfront_distribution_hostname" {
-  value = "${aws_cloudfront_distribution.website.domain_name}"
+  description = "The hostname of the CloudFront Distribution (use for DNS CNAME)."
+  value       = "${aws_cloudfront_distribution.website.domain_name}"
 }