all_equal link is incorrect

[RoelKluin]

This is concerning the cheat sheet here: https://danielkeep.github.io/itercheat_baked.html

The all_equal link does not resolve: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.all_equal

The correct link seems to be: https://docs.rs/itertools/*/itertools/trait.Itertools.html#method.all_equal