Convert dataset sizes from base 2 to base 10 in the dataset card

Convert dataset sizes from base 2 (MiB) to base 10 (MB) in the dataset card, as it is the case in the dataset viewer.
See: https://github.com/huggingface/datasets/issues/5708

README.md

@@ -1086,7 +1086,7 @@ dataset_info:
 - **Paper:** [Learning Robust Global Representations by Penalizing Local Predictive Power](https://arxiv.org/abs/1905.13549v2)
 - **Leaderboard:** https://github.com/HaohanWang/ImageNet-Sketch#imagenet-sketch-leaderboard
 - **Point of Contact:** [Haohan Wang](mailto:[email protected])
-- **Size of downloaded dataset files:** 7.59 GB
+- **Size of downloaded dataset files:** 8.15 GB
 
 ### Dataset Summary