How to enable Markdown in IntelliJ?

I installed the IDEA-MARKDOWN in IntelliJ 13.1.5 and restarted. I Added some markdown to a class's javadocs, but I don't see a bold title when I press on the class name CTRL-Q, I only see the "H2 Title" in bold:

/**
 * ## H1 Title
 * <h2>H2 Title</h2>
 */
public class Test {

}

How do I enable Markdown?

Enabling Markdown for Plugin-enabled Sites Go to Jetpack → Settings → Writing. Under Composing click the button next to “Write posts or pages in plain-text Markdown syntax.” If the Save Settings button is not grayed out, click it to save the changes.

What is Markdown Navigator?

There is another plugin which is "Markdown Navigator Enhanced" and that I tested on Android Studio 3.5. 2, it enables a toolbar with some editing functions as well as the preview options. You can Edit, preview or do both in a split window, you can even show the HTML code.

To properly render Markdown Javadoc comments, I think you need the Pegdown Doclet for IDEA plugin.