DOC: Discuss MultiIndex in Indexing and selecting data section

[mcp292]

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/user_guide/indexing.html

Documentation problem

The use for multiindex should be documented in Indexing and selecting data.

There are currently no examples of extracting data where different columns equal different values, only inequalities.

Suggested fix for documentation

Adding such an example will allow to segue into the reasoning for, use, and benefits of using a MultiIndex.

A similar discussion to this SO answer would be helpful.

[rhshadrach]

There is also a MultiIndex / advanced indexing section:

https://pandas.pydata.org/docs/user_guide/advanced.html

Are the examples you mentioned missing from that as well?