Use more YAML-like syntax for the dynamic DNS configurations

Related to #681 (Github Pull Request)

docs/configuring-playbook-dynamic-dns.md

@@ -8,12 +8,20 @@ set this up, you'll need to get the username/password from your DNS provider. Fo
 google domains, this process is described [here](https://support.google.com/domains/answer/6147083).
 After you've gotten the proper credentials you can add the following config to your inventory/host_vars/matrix.DOMAIN/vars.yml:
 
-```
+```yaml
 matrix_dynamic_dns_enabled: true
+
 matrix_dynamic_dns_domain_configurations: |
   {{
     [{'provider': 'domains.google.com', 'protocol': 'dyndn2', 'username': 'XXXXXXXXXXXXXXXX', 'password': 'XXXXXXXXXXXXXXXX', 'domain': matrix_domain}]
   }}
+
+matrix_dynamic_dns_domain_configurations:
+  - provider: domains.google.com
+    protocol: dyndn2
+    username: XXXXXXXXXXXXXXXX
+    password: XXXXXXXXXXXXXXXX
+    domain: "{{ matrix_domain }}"
 ```
 
 ## Additional Reading