Bug#931459: release-notes: Release notes: mention re-introduction of the standard live image

[jonathan]

Package: release-notes
Severity: normal

Debian Live Buster re-introduces the standard live image. This is a basic 
Debian image that contains a base Debian system without any graphical user 
interface. Because it installs from a squashfs image rather than installing the 
system files using dpkg, installation times are a lot faster than installing 
from a minimal Debian installation image.