Code blocks do not render correctly in ZK docs site

The code snippets defined inside a fenced code blocks renders correctly in Markdown; but the same code snippet does not render properly in HTML sites. This makes the docs site very ugly and difficult to comprehend. (One has to figure out where the code block starts and where it ends.)

The issue exists throughout the docs site.

For example see one of the sample pages:
https://github.com/apache/zookeeper/blob/master/zookeeper-docs/src/main/resources/markdown/zookeeperCLI.md

vs

http://zookeeper.apache.org/doc/current/zookeeperCLI.html