[gtk] font-button: Suggest non deprecated function in docs

[Mohammed Sadiq <pksadiq src gnome org>]

commit 59c8fdff29c817bfcbe08bdcf583c862a95b7993
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Thu Jun 7 15:44:14 2018 +0530

    font-button: Suggest non deprecated function in docs
    
    gtk_font_button_get_font_name() has been deprecated in 3.22 and
    its public API is removed from GTK4.

 gtk/gtkfontbutton.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 33dd4df027..b2dc3a3df1 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -548,7 +548,7 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
    * @widget: the object which received the signal.
    * 
    * The ::font-set signal is emitted when the user selects a font. 
-   * When handling this signal, use gtk_font_button_get_font_name() 
+   * When handling this signal, use gtk_font_chooser_get_font()
    * to find out which font was just selected.
    *
    * Note that this signal is only emitted when the user