add hcl hint
fixup comments
@@ -502,10 +502,10 @@ since these references get evaluated at start.
You may provide default values by means of `environment_variables` in the [`defaults` block](#defaults-block):
-```
-...
+```hcl
+// ...
origin = env.ORIGIN
-...
+// ...
defaults {
environment_variables = {
ORIGIN = "http://localhost/"
