Fix broken link to C++ toolchain configuration reference doc

RELNOTES: None
PiperOrigin-RevId: 234567746
diff --git a/site/_layouts/documentation.html b/site/_layouts/documentation.html
index a29c36d..f8a629b 100644
--- a/site/_layouts/documentation.html
+++ b/site/_layouts/documentation.html
@@ -183,7 +183,7 @@
                 <ul class="collapse sidebar-nav sidebar-submenu" id="cpp-menu">
                   <li><a href="/versions/{{ current_version }}/bazel-and-cpp.html">C++ Resources</a></li>
                   <li><a href="/versions/{{ current_version }}/cpp-use-cases.html">C++ Use Cases</a></li>
-                  <li><a href="/versions/{{ current_version }}/crosstool-reference.html">Understanding CROSSTOOL</a></li>
+                  <li><a href="/versions/{{ current_version }}/cc-toolchain-config-reference.html">C++ toolchain configuration</a></li>
                   <li><a href="/versions/{{ current_version }}/tutorial/crosstool.html">Tutorial: CROSSTOOL</a></li>
                 </ul>
               </li>