doc: Made changes to the file explaining the `UserWarning` error while using pandas `group_by's#677

Merged

MarcoGorelli merged 8 commits intonarwhals-dev:mainfrom mistShard:userwarning

Jul 30, 2024

+230-96

Commits on Jul 26, 2024

Removed check-backend script
benjinwangele
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Commits on Jul 29, 2024

Merge branch 'main' of https://github.com/mistShard/narwhals
benjinwangele
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Added file explaining the userwarning error in pandas group_by's
benjinwangele
committed