[PATCH] doc: Mention "guix pull" during installation.

[Petter]

Hi,

Some new users don't run `guix pull` before installing, and can have a 
less good experience because of this. Proposing a patch to add this to 
the manual.

Thanks,
PetterFrom 2340158e5454cbb3050840821bf0fd1965d2fe79 Mon Sep 17 00:00:00 2001
From: Petter <pet...@mykolab.ch>
Date: Fri, 16 Dec 2016 09:28:32 +0100
Subject: [PATCH] doc: Mention "guix pull" during installation.

* doc/guix.texi (Proceeding with the Installation): Add "guix pull".
---
 doc/guix.texi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 46ed451..cda90ed 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6863,6 +6863,14 @@ rather than kept in memory.  This is necessary because the first phase of
 the @command{guix system init} command (see below) entails downloads or
 builds to @file{/gnu/store} which, initially, is an in-memory file system.
 
+At this point it is advisable to update the system, especially if the
+installer is more than a few weeks old. Then most, if not all, packages
+will be available as substitutes.
+
+@example
+guix pull
+@end example
+
 Next, you have to edit a file and
 provide the declaration of the operating system to be installed.  To
 that end, the installation system comes with three text editors: GNU nano
-- 
2.10.1