[wwwdocs] Document reimplementation of GNU threads library on Windows

[wwwdocs] Document reimplementation of GNU threads library on Windows

[Eric Botcazou]

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... which happened in GCC 13.

Validated with W3C's Validator and applied.

-- 
Eric Botcazou

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diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
index e324b782..3ab4a101 100644
--- a/htdocs/gcc-13/changes.html
+++ b/htdocs/gcc-13/changes.html
@@ -770,8 +770,17 @@ You may also want to check out our
 
 <!-- <h3 id="vxmils">VxWorks MILS</h3> -->
 
-<!-- <h3 id="windows">Windows</h3> -->
-
+<h3 id="windows">Windows</h3>
+<ul>
+  <li>The GNU threads library used by the <code>win32</code> thread model has
+      been reimplemented using direct Win32 API calls, except for the Objective-C
+      specific subset.  It requires Windows XP/Server 2003 or later.  The new
+      implementation also adds the support needed for the C++11 threads, using
+      again direct Win32 API calls; this additional layer requires Windows
+      Vista/Server 2008 or later.  It is recommended to use a recent version of
+      MinGW-W64 in conjunction with the <code>win32</code> thread model.
+  </li>
+</ul>
 
 <!-- .................................................................. -->
 <!-- <h2>Documentation improvements</h2> -->