Fixed closing html comment tag

Originally an arrow symbol was rendered:
![image](https://f.cloud.github.com/assets/1711792/2236876/85687150-9b70-11e3-97bd-0a6f95853288.png)

Changed to be the correct html comment closing tag and putting it all under code block:
![image](https://f.cloud.github.com/assets/1711792/2236880/9183309c-9b70-11e3-859b-cdeab003e3e7.png)