[libadwaita] preferences: fix typo in property name

[Alexander Mikhaylenko <alexm src gnome org>]

commit 9ebea39efad6b92ff51926a1c0602eed96257ab2
Author: Gleb Smirnov <glebsmirnov0708 gmail com>
Date:   Tue Jul 27 15:12:02 2021 +0300

    preferences: fix typo in property name
    
    Rename AdwPreferencesWindow:visible-child-name to
    AdwPreferencesWindow:visible-page-name

 src/adw-preferences-window.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/adw-preferences-window.c b/src/adw-preferences-window.c
index 38477675..d68502de 100644
--- a/src/adw-preferences-window.c
+++ b/src/adw-preferences-window.c
@@ -526,8 +526,8 @@ adw_preferences_window_class_init (AdwPreferencesWindowClass *klass)
    * Since: 1.0
    */
   props[PROP_VISIBLE_PAGE_NAME] =
-      g_param_spec_string ("visible-child-name",
-                           "Name of visible child",
+      g_param_spec_string ("visible-page-name",
+                           "Name of visible page",
                            "The name of the currently visible page",
                            NULL,
                            G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);