[gtk/matthiasc/for-master: 48/56] Clarify the docs for gtk_widget_class_set_css_name

[Matthias Clasen <matthiasc src gnome org>]

commit b5077d02edac3b72b77bb61eaf57e515f3e35603
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 2 10:06:01 2020 -0500

    Clarify the docs for gtk_widget_class_set_css_name
    
    Reword, and mention the default css name.

 gtk/gtkwidget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 239e9ff929..89635ba8dc 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -10356,7 +10356,8 @@ _gtk_widget_get_sizegroups (GtkWidget    *widget)
  * Sets the name to be used for CSS matching of widgets.
  *
  * If this function is not called for a given class, the name
- * of the parent class is used.
+ * set on the parent class is used. By default, GtkWidget uses
+ * the name "widget".
  */
 void
 gtk_widget_class_set_css_name (GtkWidgetClass *widget_class,