[rustdoc] --generate-macro-expansion only shows last expanded item in a macro call

Example from https://doc.rust-lang.org/nightly/nightly-rustc/src/rustc_hir/attrs/pretty_printing.rs.html#194:

print_skip!(Span, (), ErrorGuaranteed, AttrId);

gets expanded into:

impl PrintAttribute for AttrId {
    fn should_render(&self) -> bool { false }
    fn print_attribute(&self, _: &mut Printer) {}
}

The print_skip macro code:

macro_rules! print_skip {
    ($($t: ty),* $(,)?) => {$(
        impl PrintAttribute for $t {
            fn should_render(&self) -> bool { false }
            fn print_attribute(&self, _: &mut Printer) { }
        })*
    };
}

Rollup merge of rust-lang#161876 - GuillaumeGomez:expand-multiple-ite…

Unrolled build for #161876 in rollup 161906

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[rustdoc] `--generate-macro-expansion` only shows last expanded item in a macro call #157508

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[rustdoc] --generate-macro-expansion only shows last expanded item in a macro call #157508

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[rustdoc] `--generate-macro-expansion` only shows last expanded item in a macro call #157508