I second. Very good documentation indeed (and in French!), and very good tutorials too.
However, about compounds, in French, they are called "Composé" after creation. Searching for "Composé" returns nothing in the help file. Eventually, I found the explanation by looking for "Combiner" (I think it is the name of the menu item on Mac), and the page returned is called something like "relier les objets"...
Besides, it could be useful to have a link to this chapter from other pages, like pages on Layers, and those on boolean operators. My 2 cents.
Anyway, I am very happy to have AD on iPad now, and that it is soooo complete. Congratulations again.