Function rustdoc::clean::clean_fn_or_proc_macro

fn clean_fn_or_proc_macro(
    item: &Item<'_>, 
    sig: &FnSig<'_>, 
    generics: &Generics<'_>, 
    body_id: BodyId, 
    name: &mut Symbol, 
    cx: &mut DocContext<'_>
) -> ItemKind