[wwwdocs] document some G++ and libstdc++ changes for 4.6

[Jonathan Wakely]

On 10 February 2011 00:59, Jonathan Wakely wrote:
> I've checked in the attached change to htdocs/gcc-4.6/changes.html
>
> I'm sure I've missed some things worth mentioning so additions are welcome
>

And this small tweak to use an entity for the non-ASCII character
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Index: htdocs/gcc-4.6/changes.html
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RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.6/changes.html,v
retrieving revision 1.113
diff -u -r1.113 changes.html
--- htdocs/gcc-4.6/changes.html	10 Feb 2011 00:57:07 -0000	1.113
+++ htdocs/gcc-4.6/changes.html	10 Feb 2011 01:00:59 -0000
@@ -399,7 +399,7 @@
        <code>nullptr</code>. </li>
     <li>Performance improvements to the
       <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html">Debug
-      Mode</a>, thanks to François Dumont.
+      Mode</a>, thanks to François Dumont.
     </li>
     <li>Atomic operations used for reference-counting are annotated so that
       they can be understood by race detectors such as Helgrind, see