Update implementation status of P2468R2

Differential Revision: https://reviews.llvm.org/D135608

Author: usx95

clang/www/cxx_status.html

@@ -1432,7 +1432,7 @@ <h2 id="cxx23">C++2b implementation status</h2>
     <tr>
       <td>The Equality Operator You Are Looking For</td>
       <td><a href="https://wg21.link/P2468R2">P2468R2</a></td>
-      <td class="none" align="center">No</td>
+      <td class="unreleased" align="center">Clang 16</td>
     </tr>
     <tr>
       <td>De-deprecating volatile compound operations</td>