[Clang] Fix typo in cxx_status.html

Author: cor3ntin

clang/www/cxx_status.html

@@ -213,7 +213,7 @@ <h2 id="cxx26">C++2c implementation status</h2>
  <tr>
   <td>Deleting a Pointer to an Incomplete Type Should be Ill-formed</td>
   <td><a href="https://wg21.link/P3144">P3144R2</a></td>
-  <td class="Unreleased" align="center">Clang 19</td>
+  <td class="unreleased" align="center">Clang 19</td>
  </tr>
  <tr>
   <td>Ordering of constraints involving fold expressions</td>