[install-guide/F21-rewrite] Adding info about ksverdiff into Kickstart Syntax Reference

[pbokoc]

commit dd890589d9a63760c600a3d864ccc29763c66ba3
Author: Petr Bokoc <pbokoc at redhat.com>
Date:   Tue Sep 16 00:16:44 2014 +0200

    Adding info about ksverdiff into Kickstart Syntax Reference

 en-US/Kickstart_Syntax_Reference.xml |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/en-US/Kickstart_Syntax_Reference.xml b/en-US/Kickstart_Syntax_Reference.xml
index 057d44e..2cd7cb0 100644
--- a/en-US/Kickstart_Syntax_Reference.xml
+++ b/en-US/Kickstart_Syntax_Reference.xml
@@ -9,6 +9,19 @@
         This appendix describes commands and options available in Kickstart installations. For information about how to automate your installation using Kickstart, see <xref linkend="chap-kickstart-installations" />.
     </para>
     
+    <para>
+        While the general principles of Kickstart installations tend to stay the same, the commands and options can change between major releases of &PRODUCT;. You can use the <command>ksverdiff</command> command to display the differences between two versions of the Kickstart syntax. This is useful when updating an existing Kickstart file to be used with a new release. To display a list of changes in syntax between &PRODUCT;&nbsp;&PREVVER; and &PRODVER;, use the following command:
+    </para>
+    <screen>
+<prompt>$</prompt> <command>ksverdiff -f F&PREVVER; -t F&PRODVER;</command>
+    </screen>
+    <para>
+        The <option>-f</option> option specifies the release to start the comparison with, and the <option>-t</option> option to specify the release to end with. For additional information, see the <systemitem>ksverdiff(1)</systemitem> man page. Also note that you can not use this to display changes in a release that is newer than your system - the version of <package>pykickstart</package> on &PRODUCT;&nbsp;&PREVVER; can not display changes in &PRODUCT;&nbsp;&PRODVER;.
+    </para>
+    <para>
+        Additionally, you can review the <citetitle>&PRODUCT; Release Notes</citetitle>, available at <ulink url="http://docs.fedoraproject.org/">&PRODUCT; Documentation</ulink>, for a list of changes.
+    </para>
+    
     <section id="sect-kickstart-commands-installation">
         <title>Installation Methods and Sources</title>
         <para>