Updated the doc with the new completion type (SDWebImageManager loadImageWithURL)

@@ -197,16 +197,18 @@ SDWebImageManager *manager = [SDWebImageManager sharedManager];
  *
  *   This parameter is required.
  * 
- *   This block has no return value and takes the requested UIImage as first parameter.
- *   In case of error the image parameter is nil and the second parameter may contain an NSError.
+ *   This block has no return value and takes the requested UIImage as first parameter and the NSData representation as second parameter.
+ *   In case of error the image parameter is nil and the third parameter may contain an NSError.
  *
- *   The third parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
+ *   The forth parameter is an `SDImageCacheType` enum indicating if the image was retrieved from the local cache
  *   or from the memory cache or from the network.
  *
- *   The last parameter is set to NO when the SDWebImageProgressiveDownload option is used and the image is 
+ *   The fith parameter is set to NO when the SDWebImageProgressiveDownload option is used and the image is
  *   downloading. This block is thus called repeatedly with a partial image. When image is fully downloaded, the
  *   block is called a last time with the full image and the last parameter set to YES.
  *
+ *   The last parameter is the original image URL
+ *
  * @return Returns an NSObject conforming to SDWebImageOperation. Should be an instance of SDWebImageDownloaderOperation
  */
 - (id <SDWebImageOperation>)loadImageWithURL:(NSURL *)url