DOCS: Added GitBook code blocks syntax for dnsconfig.js. (#2149)

Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>

documentation/functions/global/PANIC.md

@@ -9,6 +9,8 @@ ts_return: never
 
 `PANIC` terminates the script and therefore DNSControl with an exit code of 1. This should be used if your script cannot gather enough information to generate records, for example when a HTTP request failed.
 
+{% code title="dnsconfig.js" %}
 ```javascript
 PANIC("Something really bad has happened");
 ```
+{% endcode %}