[system-administrators-guide] Bump RevHist 1-2.1

[stephenw]

commit 868cf3059ced607b9d16ab94b50d2f8c98a4c722
Author: Stephen Wadeley <swadeley at redhat.com>
Date:   Wed Mar 4 09:01:38 2015 +0100

    Bump RevHist 1-2.1

 en-US/Revision_History.xml |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/en-US/Revision_History.xml b/en-US/Revision_History.xml
index 2d980ce..333de19 100644
--- a/en-US/Revision_History.xml
+++ b/en-US/Revision_History.xml
@@ -6,6 +6,19 @@
   <simpara>
     <revhistory>
             <revision>
+            <revnumber>1-2.1</revnumber>
+            <date>Wed Mar 4 2015</date>
+            <author>
+              <firstname>Stephen</firstname>
+              <surname>Wadeley</surname>
+              <email>swadeley at redhat.com</email>
+            </author>
+            <revdescription>
+              <simplelist>
+                <member>Updated the root password resetting procedure.</member>
+              </simplelist>
+            </revdescription>
+          </revision>            <revision>
         <revnumber>1-2</revnumber>
         <date>Tue Dec 9 2014</date>
         <author>