update docs with call on meta tag for responsive

docs/scaffolding.html

@@ -357,6 +357,10 @@
         </tbody>
       </table>
 
+      <h3>Requires meta tag</h3>
+      <p>To ensure devices display responsive pages properly, include the viewport meta tag.</p>
+      <pre class="prettyprint linenums">&lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;</pre>
+
       <h3>What they do</h3>
       <p>Media queries allow for custom CSS based on a number of conditions&mdash;ratios, widths, display type, etc&mdash;but usually focuses around <code>min-width</code> and <code>max-width</code>.</p>
       <ul>