[Clang] Add the list of papers approved in Kona

This is a rather short list that does not include the list
of resolvded CWG issues, which is rather long (P3046).

Some of the links are currently invalid as they have yet to be
publicly published.

Author: cor3ntin

clang/www/cxx_status.html

@@ -147,6 +147,23 @@ <h2 id="cxx26">C++2c implementation status</h2>
   <td><a href="https://wg21.link/P2169R4">P2169R4</a></td>
   <td class="unreleased" align="center">Clang 18</td>
  </tr>
+ <!-- Fall 2023 papers (Kona) -->
+ <tr>
+  <td>Template parameter initialization</td>
+  <td><a href="https://wg21.link/P2308R1">P2308R1</a> (<a href="#dr">DR</a>)</td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Pack Indexing</td>
+  <td><a href="https://wg21.link/P2662R3">P2662R3</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+  <td>Remove Deprecated Arithmetic Conversion on Enumerations</td>
+  <td><a href="https://wg21.link/P2864R2">P2864R2</a></td>
+  <td class="none" align="center">No</td>
+ </tr>
+
 </table>
 </details>