temporarily list improved IPv6 privacy addresses

Might as well be listed as a feature until this gets fixed upstream
based on our issue reports.

static/features.html

@@ -210,6 +210,7 @@
                     <li>When the per-connection MAC randomization added by GrapheneOS is being
                     used, DHCP client state is flushed before reconnecting to a network to avoid
                     revealing that it's likely the same device as before.</li>
+                    <li>Improved IPv6 privacy addresses to prevent tracking across networks</li>
                     <li>Vanadium: hardened WebView and default browser — the WebView is what most
                     other apps use to handle web content, so you benefit from Vanadium in many apps
                     even if you choose another browser</li>