d-i Manual: 6.3.5.1. Configuring apt - removal of references to 'volatile'

[Brian Potkin <claremont102@gmail.com>]

Some references:

   http://www.debian.org/volatile/
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=665852
   http://lists.debian.org/debian-devel-announce/2011/03/msg00010.html

So with this patch Section 6.3.5.1 has had "volatile" replaced with
"release-update(s)".

An install at default priority didn't automatically add a release
updates line in /etc/apt/sources.list but I've not altered what the
Guide presently says. I did, however, add text (just lifted from the
installer itself) to explain the functions of security and release
updates.

I've not touched B.4.9. Apt setup, and probably won't. This has three
mentions of "volatile".

Regards,

Brian.

--- manual/en/using-d-i/modules/apt-setup.xml	2012-10-21 15:52:12.582381910 +0100
+++ manual/en/using-d-i/modules/apt-setup_volatile.xml	2012-10-21 16:05:53.000000000 +0100
@@ -42,16 +42,28 @@
 method you are using and possibly using choices made earlier in the
 installation. In most cases the installer will automatically add a security
 mirror and, if you are installing the stable distribution, a mirror for the
-<quote>volatile</quote> update service.
+<quote>release updates</quote> service.
 
 </para><para>
 
 If you are installing at a lower priority (e.g. in expert mode), you will
 be able to make more decisions yourself. You can choose whether or not to
-use the security and/or volatile update services, and you can choose to
+use the security and/or release updates services, and you can choose to
 add packages from the <quote>contrib</quote> and <quote>non-free</quote>
 sections of the archive.
 
+</para><para>
+
+Security updates help to keep your system secured against attacks.
+Enabling this service is strongly recomended.
+
+</para><para>
+
+Release updates provide more current versions for software that changes
+relatively frequently and where not having the latest version could
+reduce the usability of the software. It also provides regression fixes.
+This service is only available for stable and oldstable releases.
+
 </para>
 
     <sect4 id="apt-setup-cdset">
@@ -179,7 +191,7 @@
 
 whether any updated versions of packages included on the CDs or DVDs are
 available from a mirror (either a regular package mirror, or a mirror for
-security or volatile updates).
+security or release updates).
 
 </para></listitem>
 </orderedlist>
@@ -188,7 +200,7 @@
 
 Note that the last point means that, even if you choose not to use a network
 mirror, some packages may still be downloaded from the Internet if there is a
-security or volatile update available for them and those services have been
+security or release update available for them and those services have been
 configured.
 
 </para>