Move syntax-theme explainer to typography

styleguide/demopage/index.html

@@ -182,18 +182,9 @@
         <section>
           <h2>Preformatted Text</h2>
           <p>
-            This example uses manual syntax highlighting using the following CSS
-            classes:
+            This example uses manual syntax highlighting using the predefined
+            CSS classes mentioned in the typography:
           </p>
-          <ul>
-            <li><code>neutral</code></li>
-            <li><code>identifier</code></li>
-            <li><code>number</code></li>
-            <li><code>string</code></li>
-            <li><code>comment</code></li>
-            <li><code>keyword</code></li>
-            <li><code>function</code></li>
-          </ul>
           <pre
             aria-labelledby="code-positives-description"
           ><code><span class="keyword">#include</span> <span class="string">&lt;stdlib.h&gt;</span>