Update RValue::Discriminant documentation
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`RValue::Discriminant` returns zero for types without discriminant. This guarantee is already documented for `discriminant_value` intrinsics which is implemented in terms of `RValue::Discriminant`.
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Rollup of 8 pull requests Successful merges: - rust-lang#93097 (Switch settings menu to full js) - rust-lang#96587 (Refactor the WriteBackendMethods and ExtraBackendMethods traits) - rust-lang#96589 (Use source callsite in check_argument_types suggestion) - rust-lang#96599 (Update `RValue::Discriminant` documentation) - rust-lang#96614 (Add a regression test for rust-lang#92305) - rust-lang#96629 (Fix invalid keyword order for function declarations) - rust-lang#96641 (Use a yes/no enum instead of a bool.) - rust-lang#96646 (Mitigate impact of subtle invalid call suggestion logic) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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RValue::Discriminantreturns zero for types without discriminant.This guarantee is already documented for
discriminant_valueintrinsics which is implemented in terms of
RValue::Discriminant.