Committing Handbook updates

[Warren Block]

Please set me straight on how, when, and where to commit updates to the 
Handbook at present.

As I understand it, we are still in doc slush.  When is that planned to 
end?

Are small changes allowed, or should we save them for now?

There's the ISBN project branch.  Should we commit changes there now, so 
they'll be merged back when the branch is merged?

Thanks!