Add hcl style to template block; fix interpolation

Also sneak in a schmichael -> hashicorp fix in a url

Author: schmichael

website/source/docs/job-specification/template.html.md

@@ -221,21 +221,21 @@ The parser will read the JSON string, so the `$CERT_PEM` environment variable
 will be identical to the contents of the file.
 
 For more details see [go-envparser's
-README](https://github.com/schmichael/go-envparse#readme).
+README](https://github.com/hashicorp/go-envparse#readme).
 
 ## Vault Integration
 
 This example acquires a PKI certificate from Vault in PEM format and stores it into your application's secret directory.
 
-```
+```hcl
 template {
   data = <<EOH
 {{ with secret "pki/issue/foo" "common_name=foo.service.consul" "ip_sans=127.0.0.1" "format=pem" }}
 {{ .Data.certificate }}
 {{ .Data.issuing_ca }}
 {{ .Data.private_key }}{{ end }}
 EOH
-  destination   = "$${NOMAD_SECRETS_DIR}/bundle.pem"
+  destination   = "${NOMAD_SECRETS_DIR}/bundle.pem"
   change_mode   = "restart"
 }
 ```