`fn()` Trait Implementations documentation no longer correct

[asquared31415]

Location

https://doc.rust-lang.org/nightly/std/primitive.fn.html#trait-implementations-1

Summary

The documentation on the primitive fn() says that

Due to a temporary restriction in Rust’s type system, these traits are only implemented on functions that take 12 arguments or less, with the "Rust" and "C" ABIs. In the future, this may change:

This is no longer the case, the traits are implemented for all function pointer types, even on stable. I assume this just needs a documentation update, but the fact that this is such a big change makes me hesitant to do it myself without confirming.

playground example

[Noratrieb]

#108080
https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1700-2023-06-01

This was FCPed, so the docs just need to be fixed.

[asquared31415]

Alright, then I'll go ahead and put that up!
@rustbot claim