Ubuntu Help should be included as default in Unity launcher, just like what Ubuntu gnome-shell remix did when you open Activities dash overview. It's there, in front of you, just one click away to know about gnome-shell.
Make information about Ubuntu easily accessible for first time Ubuntu user/newbie to find, learn and how to use Ubuntu/Unity desktop when they using live session and after fresh install. I know, you can click on that "gear" system indicator and you can search in unity dash...But you know instead of that "A" and "U" icon stuff, system settings(again, just click on that "gear" icon, right?), bunch of libreoffice software(err, right click quicklists, maybe?) in unity launcher?
Why "hiding" the Ubuntu documentation?
I don't know the answer, maybe this video will "Help Ubuntu"?