Fixed a code typo in the theme example

Author: toddparker

docs/content/content-collapsible.html

@@ -70,9 +70,9 @@ <h2>Theming collapsible content</h2>
 		<p>To provide a stronger visual connection between the collapsible header and content, add the <code>data-content-theme</code> attribute to the wrapper and specify a theme swatch letter. This will apply the swatch's border and <em>flat</em> background color (not the gradient) to the content block and changes the corner rounding to square off the bottom of the header and round the bottom of the content block instead to visually group these elements.</p>
 
 <pre><code>		
-&lt;div data-role=&quot;collapsible&quot; <strong>data-content-theme=&quot;a&quot;</strong>&gt;
+&lt;div data-role=&quot;collapsible&quot; <strong>data-content-theme=&quot;c&quot;</strong>&gt;
    &lt;h3&gt;Header swatch A&lt;/h3&gt;
-   &lt;p&gt;I&#x27;m the collapsible content with a themed content block set to "A".&lt;/p&gt;
+   &lt;p&gt;I&#x27;m the collapsible content with a themed content block set to "C".&lt;/p&gt;
 &lt;/div&gt;
 </code></pre>