[wwwdocs] Document ARM/embedded-x_y-branch family

[Gerald Pfeifer]

Hi Terry,

On Mon, 9 Jul 2012, Terry Guo wrote:
> As it becomes our long term goal to deliver arm-none-eabi tool chain 
> based on GCC 4.6/4.7/4.8 and future branches, I am going to use the 
> following pattern to document this branch family. Is it ok to commit?

yep, this looks good (and sorry for somehow missing this at first).

The only question I'd have, that may make sense addressing in the
description, is "What kind of changes to you expect to take there,
but not the corresponding release branches? And why?"

Gerald