[user-guide] add configure PackageKit using Desktop software (KDE & GNOME)

[FORLOT Romain]

commit 889c6234dcdf00e964642ac06cbad0d9ea26491e
Author: Claneys Skyne <claneys.skyne at gmail.com>
Date:   Mon Mar 26 16:44:27 2012 +0200

    add configure PackageKit using Desktop software (KDE & GNOME)

 en-US/Managing_software.xml |   25 ++++++++++++++++++++++---
 1 files changed, 22 insertions(+), 3 deletions(-)
---
diff --git a/en-US/Managing_software.xml b/en-US/Managing_software.xml
index c0c4e95..2f6544d 100644
--- a/en-US/Managing_software.xml
+++ b/en-US/Managing_software.xml
@@ -129,11 +129,11 @@
                     </para>
 
                     <para>
-                        Once all wanted packages if selected, launch the install process by clicking on <guibutton>Apply</guibutton> button. Follow any prompts to install additional packages.
+                        Once all wanted packages are selected, launch the install process by clicking on <guibutton>Apply</guibutton> button. Follow any prompts to install additional packages.
                     </para>
 
 		    <para>
-	        	Unless an error is displayed, the application is now installed (or removed) on your computer.
+	        	Unless an error is displayed, the application is now installed on your computer.
         	    </para>
                 </section>
 
@@ -153,10 +153,29 @@
                         </para>
 
 		    <para>
-	        	Unless an error is displayed, the application is now installed (or removed) on your computer.
+	        	Unless an error is displayed, the application is now removed on your computer.
         	    </para>
                 </section>
 
+                <section id="sec-User_Guide-Using_PackageKit-PackageKit_Settings">
+                    <title>PackageKit Settings</title>
+                        <para>
+                            PackageKit can check for update periodically.
+                        </para>
+
+                        <para>
+                            For GNOME, this setting is available by <guimenu>Sofware Sources</guimenu> under <guimenu>System</guimenu> menu. You can choose between hourly, daily, weekly basis or never. You can alse set PackageKit to automatically install updates found. A common and safe choice is to set this to <guimenuitem>Only security updates</guimenuitem> which keep you aware about criticals bugs or security break.
+                        </para>
+
+                        <para>
+                            Into KDE, this setting is available by clicking on <guibutton>wrench</guibutton> button. You can choose between hourly, daily, weekly, monthly and never. And as in gnome you can set up PackageKit to automatically install updates found.
+                        </para>
+
+                        <para>
+                            You may be insterested to enable/disable repositories. You can do that into <guilabel>Software Sources</guilabel> tab by tick or untick them for enabling or disabling them respectively.
+                        </para>
+                </section>
+
 	</section>
 	
 	<section id="sect-User_Guide-Managing_software-Using_the_command_line_interface">