Fix rowspan formatting; NFC

Author: AaronBallman

clang/www/c_status.html

@@ -208,7 +208,7 @@ <h2 id="c2x">C23 implementation status</h2>
       <td class="full" align="center">Clang 9</td>
     </tr>
     <tr id="TS18661">
-      <td rowspan="10">TS 18661 Integration</td>
+      <td rowspan="8">TS 18661 Integration</td>
     </tr>
       <tr> <!-- Pre-Oct 2019 -->
         <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2314.pdf">N2314</a></td>