[libadwaita/libadwaita-1-1] doc: Warn about AdwComboRow:selected type

[Alexander Mikhaylenko <alexm src gnome org>]

commit 64a6555fcbbf898c63b5d9d8b52d21bcfc91d071
Author: António Fernandes <antoniojpfernandes gmail com>
Date:   Sat Mar 19 21:11:34 2022 +0000

    doc: Warn about AdwComboRow:selected type
    
    I didn't notice the type change when porting from libhandy and it took
    me a lot of time debugging the resulting bugs, only to realize it was a
    porting gotcha which wasn't mentioned in the porting guide.
    
    (cherry picked from commit f5b3991f77ed92485e8a930c34845abdb866e41a)

 doc/migrating-libhandy-1-4-to-libadwaita.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/doc/migrating-libhandy-1-4-to-libadwaita.md b/doc/migrating-libhandy-1-4-to-libadwaita.md
index 4192b99e..9e491cdf 100644
--- a/doc/migrating-libhandy-1-4-to-libadwaita.md
+++ b/doc/migrating-libhandy-1-4-to-libadwaita.md
@@ -178,7 +178,7 @@ model items can be converted into human-readable strings automatically without
 requiring an expression.
 
 The `HdyComboRow:selected-index` property has been renamed to
-[property@ComboRow:selected], matching [class@Gtk.DropDown].
+[property@ComboRow:selected] and its type changed from `gint` to `guint`, matching [class@Gtk.DropDown].
 
 ### Adapt to [class@PreferencesGroup] API Changes