[gnome-builder/wip/gtk4-port] plugins/buildui: add note about configure phase

[Christian Hergert <chergert src gnome org>]

commit 2c8f595729a82c0122916eb29cdb2e0f808c7dfa
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 10 11:29:21 2022 -0700

    plugins/buildui: add note about configure phase
    
    We can't extract meson targets until we've configured, for example.

 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 ad1ecf45e..4d47adbe3 100644
--- a/src/plugins/buildui/gbp-buildui-targets-dialog.ui
+++ b/src/plugins/buildui/gbp-buildui-targets-dialog.ui
@@ -16,6 +16,7 @@
             <child>
               <object class="AdwPreferencesGroup">
                 <property name="title" translatable="yes">Available Build Targets</property>
+                <property name="description" translatable="yes">Some targets may not be available until the 
project has been configured.</property>
                 <property name="header-suffix">
                   <object class="GtkSpinner" id="spinner">
                     <property name="spinning" bind-source="GbpBuilduiTargetsDialog" bind-property="busy" 
bind-flags="sync-create"/>