[wwwdocs] Add spanstream and constexpr std::string to libstdc++ changes

[Jonathan Wakely]

Pushed to wwwdocs.


---
 htdocs/gcc-12/changes.html | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
index b8524f47..10ac025f 100644
--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -289,9 +289,9 @@ a work-in-progress.</p>
 <ul>
 <li>Improved experimental C++20 support, including:
   <ul>
-  <li><code>std::vector</code>, <code>std::optional</code>,
-      and <code>std::variant</code> can be used in <code>constexpr</code>
-      functions.</li>
+  <li><code>std::vector</code>, <code>std::basic_string</code>,
+      <code>std::optional</code>, and <code>std::variant</code>
+      can be used in <code>constexpr</code> functions.</li>
   <li>Layout-compatibility and pointer-interconvertibility traits.</li>
   </ul>
 </li>
@@ -299,6 +299,7 @@ a work-in-progress.</p>
   <ul>
   <li>Monadic operations for <code>std::optional</code>.</li>
   <li><code>std::move_only_function</code></li>
+  <li><code><spanstream></code></li>
   <li><code>std::invoke_r</code></li>
   <li><code>std::basic_string::resize_and_overwrite</code></li>
   </ul>
-- 
2.31.1