`std` docs has `equivalent` methods in the search index that lead nowhere

I was checking if `std` exposed [`hashbrown::Equivalent`](https://docs.rs/hashbrown/latest/hashbrown/trait.Equivalent.html) and found these seemingly non existent methods

https://doc.rust-lang.org/std/index.html?search=equivalent