Headers can be weird.

[gregglind]

I expected this:

/**
 * ## 3. Something
 *
 * some part text
 */

to markdown as a H2 followed by a P. the initial space seems to cause some issues.

[gregglind]

Maybe replacing this:

https://github.com/bendytree/explainjs/blob/master/index.js#L28

with a [ * ?] is better?