DOC: Series.name is just Hashable, but many column arguments require str

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Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

• https://pandas.pydata.org/docs/dev/reference/api/pandas.Series.name.html
• https://pandas.pydata.org/docs/dev/reference/api/pandas.DataFrame.pivot.html

Documentation problem

In the documentation, Series.name is just required to be a Hashable. When pandas functions ask for a column label, however, it often asks for an str, e.g. in DataFrame.pivot, where it says

columns: str or object or a list of str

Suggested fix for documentation

Use Hashable everywhere to column labels as a function argument