Rollup merge of #159819 - Vastargazing:fix/poison-error-auto-cfg-note, r=GuillaumeGomez std::sync::poison: disable auto_cfg on PoisonError::new `PoisonError::new` is defined twice, once for `#[cfg(panic = "unwind")]` and once for its negation. While exactly one definition survives expansion in any given build, the method itself is actually present in every configuration. Currently, rustdoc's `auto_cfg` only looks at whichever `cfg` survived expansion and tags the method accordingly, generating a misleading "Available on panic=unwind only" portability badge in the docs. This is the same `auto_cfg` limitation previously addressed in rust-lang/rust#153964, rust-lang/rust#154311, and rust-lang/rust#156426: when an item is split into mutually-exclusive `cfg` variants that collectively cover all builds, rustdoc incorrectly marks it as conditionally available. Issue rust-lang/rust#149786 pointed out `PoisonError::new` as another case of this pattern, but it hadn't been touched yet. This PR applies the same fix as rust-lang/rust#156426 (adding `#[doc(auto_cfg = false)]` to both variants) and adds a regression test to cover this pattern going forward. r? @GuillaumeGomez
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