Secondary paragraph not handled correctly in bulleted/numbered list

[chrispcampbell]

We had a case where we wanted to use a secondary paragraph in a numbered list, like this:

1. One

2. Two

   Second paragraph

This is normally rendered like this:

1. One

2. Two

   Second paragraph

But docs-builder doesn't produce the expected result:

You can see in the marked.js lexer output that the leading whitespace before the "Second paragraph" is not preserved in the token, which confuses our parsing code.

To fix this, I think we'd need to have some extra whitespace accompany the space token or something so that the indent is preserved for the text token that follows it.

As a workaround, we can use:

1. One

2. Two<br/><br/>Second paragraph