[gnome-builder/wip/gtk4-port] plugins/buildui: add subtitle for default

[Christian Hergert <chergert src gnome org>]

commit c4b3cd017ac2e661064293f5aeeed1b7cdff094a
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 10 13:38:19 2022 -0700

    plugins/buildui: add subtitle for default

 src/plugins/buildui/gbp-buildui-targets-dialog.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/buildui/gbp-buildui-targets-dialog.ui 
b/src/plugins/buildui/gbp-buildui-targets-dialog.ui
index 1e535bcc6..206053c2d 100644
--- a/src/plugins/buildui/gbp-buildui-targets-dialog.ui
+++ b/src/plugins/buildui/gbp-buildui-targets-dialog.ui
@@ -25,6 +25,7 @@
                 <child>
                   <object class="AdwActionRow">
                     <property name="title" translatable="yes">Build System Default</property>
+                    <property name="subtitle" translatable="yes">This selection allows the build system to 
choose the best default candidate</property>
                     <property name="activatable-widget">default_target</property>
                     <child type="suffix">
                       <object class="GtkCheckButton" id="default_target">