[wwwdocs] Update reference to MMIX

[Gerald Pfeifer]

Knuth's homepage has moved, apparently.  This adjust two references
to MMIX in general and his book about it, and omits one in the GCC 3.1
release notes.

Committed.

Gerald

Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.279
diff -u -r1.279 readings.html
--- readings.html	9 Sep 2017 06:24:29 -0000	1.279
+++ readings.html	9 Sep 2017 06:31:26 -0000
@@ -208,9 +208,10 @@
    <br />MMIX is used in program examples in Donald E. Knuth's
    <a href="http://www-cs-faculty.stanford.edu/~uno/taocp.html">The Art
    of Computer Programming</a> (ISBN 0-201-89683-4).
-   <br />The <a href="http://www-cs-faculty.stanford.edu/~uno/mmix.html">MMIX
+   <br />The <a
+   href="http://www-cs-faculty.stanford.edu/~knuth/mmix.htmll">MMIX
    page</a> has more information about MMIX.  Knuth also wrote a
-   <a href="http://www-cs-faculty.stanford.edu/~uno/mmixware.html">book
+   <a href="http://www-cs-faculty.stanford.edu/~knuth/mmixware.html">book
    specifically about MMIX</a> (MMIXware, ISBN 3-540-66938-8).
  </li>
  
Index: gcc-3.1/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-3.1/changes.html,v
retrieving revision 1.72
diff -u -r1.72 changes.html
--- gcc-3.1/changes.html	29 Jan 2017 21:58:41 -0000	1.72
+++ gcc-3.1/changes.html	9 Sep 2017 06:31:26 -0000
@@ -255,8 +255,7 @@
 <h2>New Targets and Target Specific Improvements</h2>
 
 <ul>
-<li>Hans-Peter Nilsson has contributed a port to <a
-    href="http://www-cs-faculty.stanford.edu/~uno/mmix.html">MMIX</a>,
+<li>Hans-Peter Nilsson has contributed a port to MMIX,
     the CPU architecture used in new editions of Donald E. Knuth's <em>The
     Art of Computer Programming</em>.</li>