Fix template example in 30 blog post

Author: knolleary

_posts/2022-07-14-version-3-0-released.md

@@ -241,7 +241,7 @@ it should call.
 The Template node can now access environment variables using the syntax:
 
 ```
-My favourite colour is {{env.COLOUR}}.
+{% raw %}My favourite colour is {{env.COLOUR}}.{% endraw %}
 ```
 
 ### Debug node message count