Explain the difference between DVD-R and DVD+R
Originally created by @sajolida on #15751 (Redmine)
Here is what help desk has in their templates but it should be improved:
Concernig Tails, using a DVD-R or DVD+R is almost the same. Using a
DVD+R would allow someone to burn more data is there's some free
space, but that's all. Using such DVD doesn't allow someone to modify
your Tails. But you'll have to burn a new Tails DVD for every release,
which is every 6 weeks.
Using a DVD-RW or DVD+RW allow to use only one DVD, and re-burn Tails on
it every time a release is out.
It should be added to /install/dvd.