add information about clipboard access notice

From @JollyRoger.

static/faq.html

@@ -479,6 +479,10 @@
                     service cannot access it, only the foreground app that's currently focused. Clipboard
                     managers need to be implemented by the keyboard chosen as the default by the user.</p>
 
+                    <p>As of Android 12, the user is notified when an app reads clipboard content
+                    which was set by a different app. This notice is enabled by default and can be
+                    toggled under Settings ➔ Privacy ➔ Show clipboard access.</p>
+
                     <p>GrapheneOS previously restricted background clipboard access as a much earlier and
                     slightly less strict implementation of this feature. It provided a toggle for users to
                     whitelist clipboard managers, which is no longer needed now that keyboards are