[wwwdocs] Document libstdc++ additions for GCC 12 and 13

[wwwdocs] Document libstdc++ additions for GCC 12 and 13

[Jonathan Wakely]

Pushed to wwwdocs.

---
 htdocs/gcc-12/changes.html |  1 +
 htdocs/gcc-13/changes.html | 18 +++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
index b3775f82..1cefaf13 100644
--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -505,6 +505,7 @@ function Multiply (S1, S2 : Sign) return Sign is
 <li>Improved experimental C++23 support, including:
   <ul>
   <li>Monadic operations for <code>std::optional</code>.</li>
+  <li><code>std::expected</code></li>
   <li><code>std::move_only_function</code></li>
   <li><code>&lt;spanstream&gt;</code></li>
   <li><code>std::basic_string::resize_and_overwrite</code></li>
diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
index 3876ad77..d9879d79 100644
--- a/htdocs/gcc-13/changes.html
+++ b/htdocs/gcc-13/changes.html
@@ -224,14 +224,30 @@ a work-in-progress.</p>
 
 <h4 id="libstdcxx">Runtime Library (libstdc++)</h4>
 <ul>
+  <li>Improved experimental support for C++20, including:
+    <ul>
+    <li><code>&lt;format&gt;</code> header and <code>std::format</code>.</li>
+    <li><code>std::chrono::utc_clock</code> and other clocks, time zones,
+      and <code>std::format</code> support in the <code>&lt;chrono&gt;</code>
+      header.
+    </li>
+    </ul>
+  </li>
   <li>Improved experimental support for C++23, including:
     <ul>
     <li>Additions to the <code>&lt;ranges&gt;</code> header:
       <code>views::zip</code>, <code>views::zip_transform</code>,
       <code>views::adjacent</code>, <code>views::adjacent_transform</code>
       <code>views::pairwise</code>, <code>views::slide</code>,
-      <code>views::chunk</code>, <code>views::chunk_by</code>.
+      <code>views::chunk</code>, <code>views::chunk_by</code>,
+      <code>views::repeat</code>, <code>views::chunk_by</code>,
+      <code>views::cartesian_product</code>, <code>views::as_rvalue</code>.
+    </li>
+    <li>Monadic operations for <code>std::optional</code>.</li>
+    <li>Constexpr <code>std::bitset</code>, <code>std::to_chars</code>
+      and <code>std::from_chars</code>.
     </li>
+    <li>Library support for extended floating-point types.</li>
     </ul>
   </li>
   <li>Support for the <code>&lt;experimental/scope&gt;</code> header
-- 
2.39.0

[wwwdocs] Fix typo in libstdc++ release notes

[Jonathan Wakely]

The monadic ops for std::optional were in GCC 12, I meant to say
std::expected in the GCC 13 release notes.

---
 htdocs/gcc-13/changes.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
index d9879d79..41a117b4 100644
--- a/htdocs/gcc-13/changes.html
+++ b/htdocs/gcc-13/changes.html
@@ -243,7 +243,7 @@ a work-in-progress.</p>
       <code>views::repeat</code>, <code>views::chunk_by</code>,
       <code>views::cartesian_product</code>, <code>views::as_rvalue</code>.
     </li>
-    <li>Monadic operations for <code>std::optional</code>.</li>
+    <li>Monadic operations for <code>std::expected</code>.</li>
     <li>Constexpr <code>std::bitset</code>, <code>std::to_chars</code>
       and <code>std::from_chars</code>.
     </li>
-- 
2.39.0