DOC: improve doc string for .aggregate and df.transform #22636
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Since #21224, operations using
axis=1
in df.aggregate and df.transform now work the same as whenaxis=0
.This PR updates the methods' doc strings to reflect that. For example, we can now pass a dict to DataFrame.agg/transform, also when
axis=1
, and DataFrame.transform now accepts anaxis
parameter.Also some related minor clarifications.