CHANGES move to "UPGRADING-pre-2.8"

UPGRADING

+Please consult The Bugzilla Guide for instructions on how to upgrade
+Bugzilla from an older version.  The Guide can be found with this
+distribution, in docs/html, docs/txt, and docs/sgml.

CHANGES → UPGRADING-pre-2.8

-This file contains only important changes made to Bugzilla.  If you
-are updating from an older verseion, make sure that you check this file!
+This file contains only important changes made to Bugzilla before release
+2.8.  If you are upgrading from version older than 2.8, please read this file.
+If you are upgrading from 2.8 or newer, please read the Installation and
+Upgrade instructions in The Bugzilla Guide, found with this distribution in
+docs/html, docs/txt, and docs/sgml.
 
-For a more complete list of what has changed, use Bonsai
+For a complete list of what changes, use Bonsai
 (http://cvs-mirror.mozilla.org/webtools/bonsai/cvsqueryform.cgi) to
 query the CVS tree.  For example,