Pandas version checks

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

Location of the documentation

https://pandas.pydata.org/docs/dev/reference/api/pandas.DataFrame.unstack.html#pandas.DataFrame.unstack

Documentation problem

Currently the docs stipulate that onlyint,str anddict are allowed for thefill_value, yet it seems like all the types that could be used when creating aDataFrame seem to pass at runtime. I have not tried them all yet but int, float, complex, timestamp are working fine.

Suggested fix for documentation

Add all allowed types for dataframe elements for thefill_value field.
Happy to create the PR if this is agreed by the maintainers. I will raise the issue in the pandas-stubs repo.