📝 add menu config informations in manpages

man/waybar-backlight.5.scd

@@ -81,6 +81,19 @@ The *backlight* module displays the current backlight level.
 	default: 1.0 ++
 	The speed at which to change the brightness when scrolling.
 
+*menu*: ++
+	typeof: string ++
+	Action that popups the menu.
+
+*menu-file*: ++
+	typeof: string ++
+	Location of the menu descriptor file. There need to be an element of type
+	GtkMenu with id *menu*
+
+*menu-actions*: ++
+	typeof: array ++
+	The actions corresponding to the buttons of the menu.
+
 # EXAMPLE:
 
 ```