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

@@ -219,9 +219,9 @@ en
 
 #### default
 
-- **Size of downloaded dataset files:** 27.91 MB
-- **Size of the generated dataset:** 45.68 MB
-- **Total amount of disk used:** 73.60 MB
+- **Size of downloaded dataset files:** 29.27 MB
+- **Size of the generated dataset:** 47.90 MB
+- **Total amount of disk used:** 77.18 MB
 
 An example of 'validation' looks as follows:
 ```