Auto merge of #34232 - ollie27:rustdoc_inline, r=alexcrichton

rustdoc: Don't inline #[doc(hidden)] pub use

Currently if a `#[doc(hidden)] pub use` item is inlined the `hidden`
attribute is ignored so the item can appear in the docs. By never inlining
such imports, they can be stripped.

An example in `std` is [`__OsLocalKeyInner`](https://doc.rust-lang.org/nightly/std/thread/struct.__OsLocalKeyInner.html) which clearly should not be documented.

diff --cc src/librustdoc/clean/mod.rs
Simple merge

diff --cc src/librustdoc/visit_ast.rs
Simple merge