updated Rhythmbox and Ubuntu One docs

[Matt Griffin]

Hi,

I updated the help content for Rhythmbox and Ubuntu One that I wrote for
the Ubuntu Manual project. If you think it would be possible to include
it in Ubuntu Docs, here are the branches.

https://code.launchpad.net/~mattgriffin/ubuntu-manual/10.10-updated-rhythmbox-content
https://code.launchpad.net/~mattgriffin/ubuntu-manual/10.10-updated-u1-content

Thanks!

Matt Griffin