Cartesian product is in the docs, but does not exist anymore

[Mafii]

See https://polyadic.github.io/funcky/book/enumerable-extensions/enumerable-extensions.html#cartesianproduct

Should probably be removed from the docs, or the alternative marked :)

[bash]

Good catch :)

It should be easy to update the docs with an example using SelectMany (the trick is to pass a result selector in addition to the regular selector).