[wwwdocs] Remove redirected link to AMD x86-64 release

[Gerald Pfeifer]

This page now goes to the general AMD press release page, which we
don't want to link to (and which does not have the original information
anymore).  So, gone it is.

Gerald

Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.230
diff -u -3 -p -r1.230 readings.html
--- readings.html	31 Mar 2013 21:15:48 -0000	1.230
+++ readings.html	1 Apr 2013 10:05:03 -0000
@@ -147,7 +147,6 @@ Intel®64 and IA-32 Architectures Sof
   <br /><a href="http://www.agner.org/optimize/">http://www.agner.org/optimize/</a>
   <br /><a href="http://www.sandpile.org">www.sandpile.org:</a>
   Christian Ludloff's technical x86 processor information.
-  <br /><a href="http://www.amd.com/us-en/Corporate/VirtualPressRoom/0,,51_104_857_875^2371,00.html">AMD's x86-64 architecture</a>
  </li>
  
   <li>i860