[user-guide] Fix revision number to be able to build this guide using Publican 4

[Jared Smith]

commit ee6e08884b94112273a3ace34dfecce31646942b
Author: Jared K. Smith <jaredsmith at jaredsmith.net>
Date:   Fri Mar 21 15:57:37 2014 -0400

    Fix revision number to be able to build this guide using Publican 4

 en-US/Revision_History.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Revision_History.xml b/en-US/Revision_History.xml
index 9198a41..a9ec30b 100644
--- a/en-US/Revision_History.xml
+++ b/en-US/Revision_History.xml
@@ -7,7 +7,7 @@
 	<simpara>
 		<revhistory>
 			<revision>
-				<revnumber>15.9.0</revnumber>
+				<revnumber>15.9.0-1</revnumber>
 				<date>Mon Aug 15, 2011</date>
 				<author>
 					<firstname>Nathan</firstname>