Incorrect docs generated for `derive_const` traits

[Expyron]

This is currently in beta; not yet in stable.

The beta docs (here) show that the PartialEq and PartialOrd implementations of std::cmp::Ordering are const.

Same for TypeId (only in nightly for now).

Both use derive_const to generate the trait implementations.
Const traits do not work outside nigthly, and only with feature const_trait_impl enabled, so they should not be marked as such in the documentation.

Trying to use these methods in a const context gives an error, as intended:
https://play.rust-lang.org/?version=beta&mode=debug&edition=2021&gist=bba4e8edb1baa3743739b3cb207e6892