drawin: Hide from ldoc

This object should not be used directly by the vast majority
of users.

docs/config.ld

@@ -85,6 +85,9 @@ file = {
         -- Ignore some parts of the widget library
         '../lib/awful/widget/init.lua',
 
+        -- Ignore the drawing window, users should only care about wiboxes
+        '../objects/drawin.c',
+
         -- exclude layout, but we need an extra bit of documentation elsewhere.
         '../lib/awful/layout/suit/'
     }

objects/screen.c

@@ -128,7 +128,7 @@
  *
  * @property workarea
  * @see client.struts
- * @see drawin.struts
+ * @see wibox.struts
  * @param table
  * @tfield integer table.x The horizontal position
  * @tfield integer table.y The vertical position