Fix indexing in split commit messages
MEMBER
Hi ! this is expected and is coherent with other naming conventions in `datasets` such as parquet shards naming
2025-04-28T13:50:57Z
https://github.com/huggingface/datasets/pull/7525#issuecomment-2835318434
https://api.github.com/repos/huggingface/datasets/issues/7525
IC_kwDODunzps6o_4ai
https://api.github.com/repos/huggingface/datasets/issues/comments/2835318434/reactions
2025-04-28T13:50:57Z
https://api.github.com/repos/huggingface/datasets/issues/comments/2835318434
https://avatars.githubusercontent.com/u/42851186?v=4
https://api.github.com/users/lhoestq/events{/privacy}
https://api.github.com/users/lhoestq/followers
https://api.github.com/users/lhoestq/following{/other_user}
https://api.github.com/users/lhoestq/gists{/gist_id}
https://github.com/lhoestq
lhoestq
MDQ6VXNlcjQyODUxMTg2
https://api.github.com/users/lhoestq/orgs
https://api.github.com/users/lhoestq/received_events
https://api.github.com/users/lhoestq/repos
https://api.github.com/users/lhoestq/starred{/owner}{/repo}
https://api.github.com/users/lhoestq/subscriptions
User
https://api.github.com/users/lhoestq
public
When a large commit is split up, it seems the commit index in the message is zero-based while the total number is one-based. I came across this running `convert-to-parquet` and was wondering why there was no `6-of-6` commit. This PR fixes that by adding one to the commit index, so both are one-based.

Current behavior:
<img width="463" alt="Screenshot 2025-04-17 at 1 00 17 PM" src="https://github.com/user-attachments/assets/7f3d389e-cb92-405d-a3c2-f2b1cdf0cb79" />