contrib/win32: updated title of the hgbook

contrib/win32/ReadMe.html

@@ -35,8 +35,8 b''
       For documentation, please visit the <a
       href="http://www.selenic.com/mercurial">Mercurial web site</a>.
       You can also download a free book, <a
-      href="http://hgbook.red-bean.com/">Distributed revision control
-      with Mercurial</a>.
+      href="http://hgbook.red-bean.com/">Mercurial: The Definitive
+      Guide</a>.
     </p>
 
     <p>