DOC: MultiIndex.swaplevel default argument values could use an explanation

[Dr-Irv]

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/reference/api/pandas.MultiIndex.swaplevel.html#pandas.MultiIndex.swaplevel

Documentation problem

The default values for swaplevel() are defined as def swaplevel(self, i=-2, j=-1). Level numbers should start at 0. What the default does is refer to the last 2 levels.

Suggested fix for documentation

I think it would be worthwhile to indicate that negative values are referring to the position of the level relative to the end of the levels of the MultiIndex

Or add something that says that the default swaps the last 2 levels of the MultiIndex

[dkane01]

take