gtk3-demo: Improve the overlay demo

Add some more information to the description.

diff --git a/demos/gtk-demo/overlay.c b/demos/gtk-demo/overlay.c
index c39189eced5aa240af9e834db9aa4138dcd56d59..f06da408e6b276589766324c91d5ed1aa85ac6bb 100644 (file)
--- a/demos/gtk-demo/overlay.c
+++ b/demos/gtk-demo/overlay.c
@@ -1,6 +1,10 @@
 /* Overlay
  *
- * Stack widgets in static positions over a main widget.
+ * Shows widgets in static positions over a main widget.
+ *
+ * The overlayed widgets can be interactive controls such
+ * as the entry in this example, or just decorative, like
+ * the big blue label.
  */
 
 #include <gtk/gtk.h>