FR: Add proper description of markdown-table extension.

[jackdewinter]

Prerequisites

• Are you running the latest version of this application?
• Have you checked the Frequently Asked Questions document?
• Did you perform a cursory search of other issues to look for related issues?

Feature Request

Description

Update the documentation to include information on the markdown tables extension.

Desired Behavior of Feature

As with most of the other extensions, this extension is disabled by default. Unless the extension is properly documented, they will not know how to enable it and use it.

What Are the Benefits of This Feature?

Users will be able to find information about the new extension, instead of it being "hidden".