[C23] Remove WG14 N2517 from the status page

This paper proposes no normative changes, just updates an example in
the standard. It was incorrect for us to have marked it as No in the
first place.

Author: AaronBallman

clang/www/c_status.html

@@ -330,11 +330,6 @@ <h2 id="c2x">C23 implementation status</h2>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf">N2508</a></td>
       <td class="full" align="center">Clang 18</td>
     </tr>
-    <tr>
-      <td>Clarification request for C17 example of undefined behavior</td>
-      <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2517.pdf">N2517</a></td>
-      <td class="none" align="center">No</td>
-    </tr>
     <tr>
       <td>Querying attribute support</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2553.pdf">N2553</a></td>