[master] update copyright year in guide and messages manual

Update copyright year for guide.

Update copyright year for messages manual.
Also remove the paragraph introducing bind10 from the messages manual
(it was incomplete, so misleading).
These were in the script)

This is trivial, so no review.

doc/guide/bind10-guide.xml

@@ -30,7 +30,7 @@
     <subtitle>Administrator Reference for BIND 10</subtitle>
 
     <copyright>
-      <year>2010-2012</year><holder>Internet Systems Consortium, Inc.</holder>
+      <year>2010-2013</year><holder>Internet Systems Consortium, Inc.</holder>
     </copyright>
 
     <abstract>

tools/system_messages.py

@@ -71,15 +71,10 @@ SEC_HEADER="""<?xml version="1.0" encoding="UTF-8"?>
     <title>BIND 10 Messages Manual</title>
 
     <copyright>
-      <year>2011-2012</year><holder>Internet Systems Consortium, Inc.</holder>
+      <year>2011-2013</year><holder>Internet Systems Consortium, Inc.</holder>
     </copyright>
 
     <abstract>
-      <para>BIND 10 is a Domain Name System (DNS) suite managed by
-	  Internet Systems Consortium (ISC). It includes DNS libraries
-	  and modular components for controlling authoritative and
-	  recursive DNS servers.
-      </para>
       <para>
         This is the messages manual for BIND 10 version &__VERSION__;.
 	    The most up-to-date version of this document, along with