Update 256x256/readme

256x256/readme

@@ -32,5 +32,3 @@ And then decompress the file:
 tar xvzf image_256x256.tar.gz
 ``` 
 
-Download the segmentation annotations from `./256x256/segments_256x256.tar.gz`. We provide the segmentations of test scenes 3100-3199 for OCTScenes-A and 4900-4999 for OCTScenes-B. Each segmentation annotation image is named as `[scene_id]_[frame_id].png`. The int number in each pixel represents the index of the object (ranges from 1 to 10, and 0 represents the background).
-