NEWS: reorder entries by subject, fix some typos and descriptions (#5511)

NEWS: reorder entries by subject, fix some typos and descriptions (#5511)

This doesn't add anything major, but moves some stuff around.
In particular changes which might require updates to the build
environment (new kernel requirements, cgroup stuff, dbus, etc)
are moved to the top, where it's most likely that people will
read them. In particular cgroup hierarchy changes are moved to the
top because they're most likely to be problematic.

Various items are grouped by subject where it's easy.

The description of list-jobs --after/--before was reversed.