Add doc for va_list APIs I observed that [PR146521](https://github.com/rust-lang/rust/pull/146521) submitted two weeks ago resolved some documentation issues related to `VaListImpl`, similar to the previous [PR136969](https://github.com/rust-lang/rust/pull/136969). This PR specifically adds requirements about argument availability for `VaListImpl::arg`, and also adds safety descriptions to the three associated intrinsic APIs. |
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| Cargo.toml | ||