Reference nonnumeric in doctring of sorter

[KronosTheLate]

I would have needed this pointer, so I added it when discovering the possibility.

[jkrumbiegel]

Closing this due to outdated doctests, but I also don't quite see the connection between sorter and nonnumeric. Any categorical variable will be sorted by default, that's not special about nonnumeric?

[KronosTheLate]

It is just that I figured I was not the only one who would want to use integers as categorical variables, converted them to strings, and then wanted to sort them and thereby found the sorter function. For that situation it would be more apropriate to use nonnumeric, which is why I thought it made sende to mention it in the docstring. Also, the examples are usefull in ane case, so closing feels a little premature.