[system-administrators-guide] Remove X Windows chapter

[stephenw]

commit d9bb2657d6438c701d832c0e58a6f877603dac5a
Author: Stephen Wadeley <swadeley at redhat.com>
Date:   Tue Dec 9 06:05:38 2014 +0100

    Remove X Windows chapter
    
    This out-of-date chapter seems redundant
    for example, Gnome docs cover desktop setings

 en-US/System_Administrators_Guide.xml |    1 -
 en-US/The_X_Window_System.xml         | 1326 ---------------------------------
 2 files changed, 0 insertions(+), 1327 deletions(-)
---
diff --git a/en-US/System_Administrators_Guide.xml b/en-US/System_Administrators_Guide.xml
index 5292977..8dcf8b4 100644
--- a/en-US/System_Administrators_Guide.xml
+++ b/en-US/System_Administrators_Guide.xml
@@ -81,7 +81,6 @@
   </part>
   <!-- APPENDIXES -->
   <xi:include href="RPM.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
-  <xi:include href="The_X_Window_System.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
   <xi:include href="Revision_History.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
   <!-- INDEX -->
   <index />