DOCS: [GitBook] Added code blocks syntax for dnsconfig.js (#2137)

documentation/providers/powerdns.md

@@ -22,6 +22,7 @@ Example:
 ## Metadata
 Following metadata are available:
 
+{% code title="dnsconfig.js" %}
 ```javascript
 {
     'default_ns': [
@@ -31,13 +32,15 @@ Following metadata are available:
     'dnssec_on_create': false
 }
 ```
+{% endcode %}
 
 - `default_ns` sets the nameserver which are used
 - `dnssec_on_create` specifies if DNSSEC should be enabled when creating zones
 
 ## Usage
-An example `dnsconfig.js` configuration:
+An example configuration:
 
+{% code title="dnsconfig.js" %}
 ```javascript
 var REG_NONE = NewRegistrar("none");
 var DSP_POWERDNS = NewDnsProvider("powerdns");
@@ -46,6 +49,7 @@ D("example.tld", REG_NONE, DnsProvider(DSP_POWERDNS),
     A("test", "1.2.3.4")
 );
 ```
+{% endcode %}
 
 ## Activation
 See the [PowerDNS documentation](https://doc.powerdns.com/authoritative/http-api/index.html) how the API can be enabled.