The Markdown documentation now includes a section on uploading images to

fields. This is pretty basic, but touches upon the feature. It's linked

to in the Images section for the Markdown reference.
The main page for the User Manual also improves the Markdown section,

linking to this new sub-section as well as the Basic Syntax, Code

Samples, and Emoji sub-sections.

Built the docs and checked the links.
Checked spelling.