[packagekit] Backend functions description

[Mounir Lamouri]

Hi,

I'm working on the portage backend and I'm a bit confused by some backend
functions use (and usage). Unfortunately, backend functions are not really
documented. Maybe it could be great to add just a sentence about what the
function should do and how on this page :
http://www.packagekit.org/gtk-doc/backends-spawn-methods.html ? Or/and in
lib/python/packagekit/backend.py

Thanks,
Mounir