doc: Explain that packages can be installed in the installation system.

* doc/guix.texi (Preparing for Installation): Add paragraph about
package installation in the installation system.
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Ludovic Courtès 2016-06-03 09:53:46 +02:00
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@ -5982,6 +5982,11 @@ dependencies of your system configuration can be downloaded. See the
``Networking'' section below.
@end quotation
The installation system includes many common tools needed for this task.
But it is also a full-blown GuixSD system, which means that you can
install additional packages, should you need it, using @command{guix
package} (@pxref{Invoking guix package}).
@subsubsection Keyboard Layout
@cindex keyboard layout