[cxx_status] Fix status of P1766R to not bleed into adjacent cells.

Author: zygoloid

clang/www/cxx_status.html

@@ -1091,10 +1091,11 @@ <h2 id="cxx20">C++2a implementation status</h2>
     </tr>
       <tr> <!-- from Cologne -->
         <td><a href="https://wg21.link/p1766r1">P1766R1</a> (<a href="#dr">DR</a>)</td>
-        <td rowspan="3" class="unreleased" align="center">Clang 11</td>
+        <td class="unreleased" align="center">Clang 11</td>
       </tr>
       <tr>
         <td><a href="https://wg21.link/p1811r0">P1811R0</a></td>
+        <td rowspan="2" class="none" align="center">No</td>
       </tr>
       <tr>
         <td><a href="https://wg21.link/p1703r1">P1703R1</a></td>