[C23] Remove WG14 N2416 from the C status page

This paper did not add any normative changes for us to check
conformance against. It added a note describing a potential behavioral
difference between compile-time and runtime evaluation of negative
floating-point values in the presence of rounding modes.

clang/www/c_status.html

@@ -750,11 +750,6 @@ <h2 id="c2x">C23 implementation status</h2>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2379.htm">N2379</a></td>
       <td class="unknown" align="center">Unknown</td>
     </tr>
-    <tr>
-      <td>Floating-point negation and conversion</td>
-      <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2416.pdf">N2416</a></td>
-      <td class="unknown" align="center">Unknown</td>
-    </tr>
     <tr>
       <td>Annex F.8 update for implementation extensions and rounding</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2384.pdf">N2384</a></td>