RFR (S) 8208665: Amend cross-compilation docs with qemu-debootstrap recipe

[Aleksey Shipilev]

On 08/13/2018 05:16 PM, Martin Buchholz wrote:
> Aleksey, your use of "base" platform seems a bit unusual.  Elsewhere in the same document, it's
> referred to as "build".  Otherwise looks good (thanks for documenting).

Right. Got mixed up with Debian's "base system". Fixed here:
 http://cr.openjdk.java.net/~shade/8208665/webrev.03/

-Aleksey