[wwwdocs] Document some more C++20 support in libstdc++

[Jonathan Wakely]

Committed.



commit feb29e18726065475769568bf46860fada5c4257
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Dec 4 23:26:45 2019 +0000

    Document some more C++20 support in libstdc++

diff --git a/htdocs/gcc-10/changes.html b/htdocs/gcc-10/changes.html
index afbcd067..dadd3f22 100644
--- a/htdocs/gcc-10/changes.html
+++ b/htdocs/gcc-10/changes.html
@@ -171,7 +171,7 @@ a work-in-progress.</p>
     <ul>
       <li> <code>std::span</code> (thanks to JeanHeyd Meneide). </li>
       <li>
-        Constexpr support in <code>&lt;algorithm&gt;</code>
+        Constexpr support in <code>&lt;algorithm&gt;</code> and elsewhere
         (thanks to Edward Smith-Rowland).
       </li>
       <li>
@@ -179,7 +179,11 @@ a work-in-progress.</p>
         <code>std::atomic&lt;</code><i>floating point</i><code>&gt;</code>.
       </li>
       <li> <code>std::ssize</code>, <code>std::to_array</code>. </li>
-      <li> <code>&lt;concepts&gt;</code>. </li>
+      <li>
+        <code>&lt;concepts&gt;</code> and some parts of
+        <code>&lt;ranges&gt;</code>.
+      </li>
+      <li> <code>&lt;compare&gt;</code>. </li>
       <li> <code>&lt;numbers&gt;</code>. </li>
     </ul>
   </li>