Fixed mistake in github codeblock test

test/cases/github-style-codeblock.html

@@ -7,7 +7,7 @@
 }
 </code></pre>
 
-And some HTML
+<p>And some HTML</p>
 
 <pre><code class="html">&lt;div&gt;HTML!&lt;/div&gt;
 </code></pre>