rustdoc doesn't show that fns inside extern { ... } are unsafe #14188
Description
e.g. http://static.rust-lang.org/doc/master/core/intrinsics/ffi.uninit.html, vs http://static.rust-lang.org/doc/master/core/mem/fn.uninit.html which is defined in Rust.