Added explanations on how to query without a browser

templates/dig.html

@@ -157,6 +157,9 @@
 	<h3>Why queryting this service is still useful</h3>
 	<p>This service most probably doesn't share its cache with your local resolver, this way you have a way to see if your DNS-change had the effect it should have.</p>
 	<p>It may also be useful for debugging other dns problems or to get around a local resolver that is lying to you because your ISP is a <i>something</i>.</p>
+	<h3>How?</h3>
+	<p>You can choose between the <code>html</code>, <code>text</code> and <code>json</code> format.</p>
+	<p>An example of an url could be: <code>{{ extra.base_url }}/dig/example.org?format=json</code></p>
 </section>
 
 {% endblock %}