[gtk/matthiasc/for-main] docs: Fix a spinbutton example

[Matthias Clasen <matthiasc src gnome org>]

commit 3bae7f540ef7b8e990c5367f831f94de67a010b5
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 4 07:41:48 2022 -0400

    docs: Fix a spinbutton example
    
    We need to use editable api for editable functionality.

 gtk/gtkspinbutton.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index fb5ffbf310..72b7934f54 100644
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -514,7 +514,7 @@ gtk_spin_button_class_init (GtkSpinButtonClass *class)
    *    adjustment = gtk_spin_button_get_adjustment (spin);
    *    value = (int)gtk_adjustment_get_value (adjustment);
    *    text = g_strdup_printf ("%02d", value);
-   *    gtk_spin_button_set_text (spin, text):
+   *    gtk_editable_set_text (GTK_EDITABLE (spin), text):
    *    g_free (text);
    *
    *    return TRUE;