add config_name and data_files to datasetcard.md specs

[lappemic]

As realised in #1222 the specs of the datasetcard are not up to date. This PR therefore updates the specs.

Let me know if this is sufficient or you would like to add more config examples.

Cc: @severo, @polinaeterna

[julien-c]

LGTM, thanks

Note that there's also a config_names: list[str] (i.e the previous property) but i don't think we need to document it

[polinaeterna]

thank you a lot for working on this!
I've left a suggestion to reformat it a bit to keep it aligned with the rest of the file.

Also I wonder if we should try to include all possible cases in these specs or keep it simple as it is now and refer to https://huggingface.co/docs/hub/datasets-manual-configuration instead? cc @severo because there are a lot of parameters apart from data_files that can be passed, for example for csv builder one can specify a sep, for audio/imagefolder builders - drop_metadata/drop_labels, etc. there is also data_dir parameter, similar to data_files.
I personally would keep it simple but not sure cc @lhoestq @stevhliu

[stevhliu]

I personally would keep it simple but not sure

Since this is just an example dataset card, we don't necessarily need to include all possible parameters. A simple example use case should suffice, with a link to more options (to allow users to explore more gradually if they'd like), as you suggested sounds great to me.

[lhoestq]

thanks for the addition ! looks like we missed this update

Also I wonder if we should try to include all possible cases in these specs or keep it simple as it is now and refer to https://huggingface.co/docs/hub/datasets-manual-configuration instead? cc @severo because there are a lot of parameters apart from data_files that can be passed, for example for csv builder one can specify a sep, for audio/imagefolder builders - drop_metadata/drop_labels, etc. there is also data_dir parameter, similar to data_files.
I personally would keep it simple but not sure cc @lhoestq @stevhliu

I think it's fine for now. We only have this page for a full list of parameters, it would be cool to have a more readable page for this that we could link to from this spec file later

[julien-c]

thanks!