Website: Update version number to be shipped with Emacs 23.1

Yesterday I pushed Org 6.16 into the Emacs CVS trunk, so we will see
this version when Emacs 23 gets released.  Unless, of course, the
release is delayed and we can install more updates later.

ORGWEBPAGE/index.org

@@ -58,8 +58,8 @@ just check the release notes and you will be up-to-date.
 This package works on Emacs 23 and 22, and (with minor restrictions)
 on Emacs 21 and XEmacs 21 (where you must also use
 /xemacs/noutline.el/ shipped with Org-mode).  The Emacs 22.2 release
-ships with Org-mode version 4.67d.  The Emacs 23 release is expected
-to ship with 6.15d.  The latest CVS emacs trunk usually contains a
+ships with Org-mode version 4.67d.  The Emacs 23.1 release is expected
+to ship with 6.16.  The latest CVS emacs trunk usually contains a
 fairly recent version, but may lag a bit behind the website release.
 
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