This documentation lives in http://developer.sugarlabs.org.
Inside sugar-build you will find the directory with the sources: sugar-docs. They are Markdown files.
Compile them running 'docs'.
Fire a local HTTP server to see them:
cd build/out/docs/ python -m SimpleHTTPServer
Make them 600px width, or less.
You may need to highlight parts of the image. Use color yellow (rgb 255, 255, 0) at 30% opacity, in a layer with Multiply mode, over the screenshot layer.
Code screenshots: use gedit and default GNOME theme to make them.