doc(cfg()) doesn't follow hide/show rules #162085

#![feature(doc_cfg)]
#![doc(auto_cfg(hide(
    target_pointer_width, values("64"),
)))]

pub trait Trait {
    fn f(&self) {}
}

pub struct X;

#[doc(cfg(any(target_pointer_width = "64", target_arch = "wasm32")))]
#[doc(auto_cfg(hide(target_arch, values("wasm32"))))]
mod imp {
    impl super::Trait for super::X { fn f(&self) {} }
}