better comments in Image/IFrame.js

lib/OpenLayers/Tile/Image/IFrame.js

@@ -15,9 +15,6 @@
  *
  * This mixin will be applied to <OpenLayers.Tile.Image> instances
  * configured with <OpenLayers.Tile.Image.maxGetUrlLength> set.
- *
- * Inherits from:
- *  - <OpenLayers.Tile.Image>
  */
 OpenLayers.Tile.Image.IFrame = {
 
@@ -30,8 +27,8 @@ OpenLayers.Tile.Image.IFrame = {
 
     /**
      * Method: draw
-     * Set useIFrame in the instance, and operate the to/from image from/to
+     * Set useIFrame in the instance, and operate the image/iframe switch.
-     * iframe switch, if necessary. Then call the parent function.
+     * Then call Tile.Image.draw.
      *
      * Returns:
      * {Boolean}