Android: Add label about auto-apply Android settings page

Change-Id: Ib647a319d7ae0891df1f8c0126002f7f892ea560
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/android/androidsettingswidget.cpp

@@ -402,6 +402,7 @@ AndroidSettingsWidget::AndroidSettingsWidget()
     using namespace Layouting;
 
     Column {
+        Tr::tr("All changes on this page take effect immediately."),
         Group {
             title(Tr::tr("Android Settings")),
             Grid {