rustdoc doesn't show explicit elided lifetimes in function signatures

I tried this code:

pub fn split(&mut self) -> (ReadHalf<'_>, WriteHalf<'_>) { ... }

I expected to see this happen: the documentation to show the explicit elided lifetime

If anything, to go with Rust 2018 idioms it seems like rustdoc should be adding this explicit elided lifetime if it was left implicit.

rustc 1.47.0-nightly (8ad7bc3f4 2020-07-21)
docsrs 0.6.0 (c9e59af 2020-07-19)

@rustbot

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