[FIX DOCSTRING] Update hf_api.py (#3182)
* [FIX DOCSTRING] Update hf_api.py
remove `baseModels`, `childrenModelCount` and `usedStorage` from `expand` possible values because they are only accepted when using the /api/models/repo_id endpoint (i.e. HfApi.model_info()).
* [MINOR:FIX] Update hf_api.py
Remove tab I added by accident
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Co-authored-by: célina <hanouticelina@gmail.com>
