Add code fencing example in the style guidlines (#12783)

* Add code fencing example in the style guidlines

* Add a period

content/en/docs/contribute/style/style-guide.md

@@ -110,8 +110,13 @@ document, use the backtick (`).
   <tr><th>Do</th><th>Don't</th></tr>
   <tr><td>The <code>kubectl run</code> command creates a Deployment.</td><td>The "kubectl run" command creates a Deployment.</td></tr>
   <tr><td>For declarative management, use <code>kubectl apply</code>.</td><td>For declarative management, use "kubectl apply".</td></tr>
+  <tr><td>Enclose code samples with triple backticks. <code>(```)</code></td><td>Enclose code samples with any other syntax.</td></tr>
 </table>
 
+{{< note >}} 
+The website supports syntax highlighting for code samples, but specifying a language is optional.
+{{< /note >}}
+
 ### Use code style for object field names
 
 <table>