Here is my suggestion of improving this user manual.
1, It seems the "screen captured image" was automatically stretched by latex compiler, so, some images were blur. Eg, fig1.1 should be viewed 200% in the adobe reader
2, All paragraphs were stared without empty characters.
3, the new CC branch use different icons for symbols like global define, class...
If it was located in a wiki, I think more people(including me with poor English) can help