Fix CloudInit doc format and give better example

website/source/docs/providers/template/r/cloudinit_config.html.markdown

@@ -45,6 +45,13 @@ resource "template_cloudinit_config" "config" {
     content      = "ffbaz"
   }
 }
+
+# Start an AWS instance with the cloudinit config as user data
+resource "aws_instance" "web" {
+  ami           = "ami-d05e75b8"
+  instance_type = "t2.micro"
+  user_data     = "${template_cloudinit_config.config.rendered}"
+}
 ```
 
 ## Argument Reference