[C23] Remove N2713 from the list

This paper was obsoleted by the changes in N3138 and US-045

Author: AaronBallman

clang/www/c_status.html

@@ -917,11 +917,6 @@ <h2 id="c2x">C23 implementation status</h2>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2688.pdf">N2686</a></td>
       <td class="full" align="center">Yes</td>
     </tr>
-    <tr>
-      <td>Integer constant expressions</td>
-      <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2713.htm">N2713</a></td>
-      <td class="none" align="center">No</td>
-    </tr>
     <tr>
       <td>Numerically equal</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2716.htm">N2716</a></td>