std docs incorrectly renders trait methods as const

[mejrs]

Location

Summary

https://doc.rust-lang.org/nightly/std/os/windows/ffi/struct.EncodeWide.html

The clone_from is marked const for seemingly every type that satisfies ~const Destruct

[compiler-errors]

We should either mark that constness as unstable or leave it out, especially on stable rust.