Dataset sizes are in MiB instead of MB in dataset cards
As @severo reported in an internal discussion (https://github.com/huggingface/moon-landing/issues/5929):

Now we show the dataset size:
- from the dataset card (in the side column)
- from the datasets-server (in the viewer)

But, even if the size is the same, we see a mismatch because the viewer shows MB, while the info from the README generally shows MiB (even if it's written MB -> https://huggingface.co/datasets/blimp/blob/main/README.md?code=true#L1932)

<img width="664" alt="Capture d’écran 2023-04-04 à 10 16 01" src="https://user-images.githubusercontent.com/1676121/229730887-0bd8fa6e-9462-46c6-bd4e-4d2c5784cabb.png">

TODO: Values to be fixed in: `Size of downloaded dataset files:`, `Size of the generated dataset:` and `Total amount of disk used:`
- [x] Bulk edit on the Hub to fix this in all canonical datasets
- [x] Bulk PR on the Hub to fix ancient canonical datasets that were moved to organizations
Example of bulk edit: https://huggingface.co/datasets/aeslc/discussions/5 looks great! 

Do you encode the fact that you've already converted a dataset? (to not convert it twice) or do you base yourself on the info contained in `dataset_info` I am only looping trough the dataset cards, assuming that all of them were created with MiB.

I agree we should only run the bulk edit once for all canonical datasets: I'm using a for-loop over canonical datasets. yes, worst case, we have this in structured data:

<img width="337" alt="image" src="https://user-images.githubusercontent.com/326577/230037051-06caddcb-08c8-4953-a710-f3d122917db3.png">
 I have just included as well the conversion from MB to GB if necessary. See: 
- https://huggingface.co/datasets/bookcorpus/discussions/2/files
- https://huggingface.co/datasets/asnq/discussions/2/files Nice. Is it another loop? Because in https://huggingface.co/datasets/amazon_us_reviews/discussions/2/files we have `32377.29 MB` for example First, I tested some batches to check the changes made. Then I incorporated the MB to GB conversion. Now I'm running the rest. The bulk edit parsed 751 canonical datasets and updated 166. Thanks a lot!

The sizes now match as expected!

<img width="1446" alt="Capture d’écran 2023-04-05 à 16 10 15" src="https://user-images.githubusercontent.com/1676121/230107044-ac2a76ea-a4fe-4e81-a925-f464b85f5edd.png">
 I made another bulk edit of ancient canonical datasets that were moved to community organization. I have parsed 11 datasets and opened a PR on 3 of them:
- [ ] "allenai/scicite": https://huggingface.co/datasets/allenai/scicite/discussions/3
- [ ] "allenai/scifact": https://huggingface.co/datasets/allenai/scifact/discussions/2
- [x] "dair-ai/emotion": https://huggingface.co/datasets/dair-ai/emotion/discussions/6