Update C status page now that Clang 18.x is released

Author: AaronBallman

clang/www/c_status.html

@@ -784,7 +784,7 @@ <h2 id="c2x">C23 implementation status</h2>
     <tr>
       <td>Free positioning of labels inside compound statements</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf">N2508</a></td>
-      <td class="unreleased" align="center">Clang 18</td>
+      <td class="full" align="center">Clang 18</td>
     </tr>
     <tr>
       <td>Clarification request for C17 example of undefined behavior</td>
@@ -1156,7 +1156,7 @@ <h2 id="c2x">C23 implementation status</h2>
     <tr>
       <td>Remove trigraphs??!</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2940.pdf">N2940</a></td>
-      <td class="unreleased" align="center">Clang 18</td>
+      <td class="full" align="center">Clang 18</td>
     </tr>
     <tr>
       <td>Improved normal enumerations</td>
@@ -1196,7 +1196,7 @@ <h2 id="c2x">C23 implementation status</h2>
     <tr>
       <td>Type inference for object declarations</td>
       <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3007.htm">N3007</a></td>
-      <td class="unreleased" align="center">Clang 18</td>
+      <td class="full" align="center">Clang 18</td>
     </tr>
     <tr>
       <td>constexpr for object definitions</td>