DOC add example to reorder levels

[MarcoGorelli]

https://pandas.pydata.org/pandas-docs/dev/reference/api/pandas.DataFrame.reorder_levels.html?highlight=reorder_levels#pandas.DataFrame.reorder_levels

No examples! Can we add at least one?

[Ashis26]

I am new to open source. May you tell me where to add the example?

[MarcoGorelli]

sure, at the end of this docstring https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L6825-L6853

[Ashis26]

Hi, I have added an example at the end of the doc. However, several tests were failed on the pull request. I don't know how can I do corrections. May you help me?

[trevorkask]

Take

[MarcoGorelli]

Take

there's already a PR open for this

[NishitaPatnaik21]

Is this close ? or Can I take this?

[jorisvandenbossche]

@Nishita5421 there is already an open PR for it