Bug#337011: installation-guide: Please document the new ways to preseed root and user passwords

[Christian Perrier <bubulle@debian.org>]

> I see you wrote the patch for boot-new/modules/shadow.xml. The only 
> problem I have with that is that this would be the first instance where 
> preseeding is covered in the main text. For the rest preseeding is only 
> introduced in general in 4.7.1 and then only in the appendix.
> 
> Putting preseeding info in the main text IMO distracts from the normal 
> installation procedure.
> 
> I do see arguments for creating a separate chapter for preseeding instead 
> of having it as a part of a more general appendix. It does deserve a more 
> extensive documentation, which currently is hard to do.
> 
> Comment please.

Well, I basically agree. I had this concern while writing the text but
I was then a bit lazy and preferred to see this item (which was at the
top of my TODO list for a while, thanks to Holger) done.

However, correct me if I'm wrong, but actually preseeding is only
covered by the examples, right?

There's no other place where preseeding is covered with more details?


If so, then I guess I should move the paragraphs I added to shadow.xml
to the example files themselves...