[system-administrators-guide] Update entities to 21

[stephenw]

commit 8af96908d2267e512198a1d2195819fce72e0c18
Author: Stephen Wadeley <swadeley at redhat.com>
Date:   Wed Dec 10 16:24:33 2014 +0100

    Update entities to 21

 en-US/System_Administrators_Guide.ent |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/en-US/System_Administrators_Guide.ent b/en-US/System_Administrators_Guide.ent
index 9fa54e9..656da29 100644
--- a/en-US/System_Administrators_Guide.ent
+++ b/en-US/System_Administrators_Guide.ent
@@ -7,8 +7,8 @@
 
 <!-- Additional Entities: -->
 <!ENTITY MAJOROS "Fedora">
-<!ENTITY MAJOROSVER "Fedora 20">
+<!ENTITY MAJOROSVER "Fedora 21">
 <!ENTITY OSORG "The Fedora Project">
-<!ENTITY PKGOS "fc20">
-<!ENTITY PRODVER "20">
+<!ENTITY PKGOS "fc21">
+<!ENTITY PRODVER "21">
 <!ENTITY BZURL "<ulink url='https://bugzilla.redhat.com/enter_bug.cgi?product=&PRODUCT;&amp;component=&BOOKID;'>http://bugzilla.redhat.com/</ulink>">