Rollup of 6 pull requests Successful merges: - #109409 (Add `minmax{,_by,_by_key}` functions to `core::cmp`) - #115494 (get rid of duplicate primitive_docs) - #115663 (ci: actions/checkout@v3 to actions/checkout@v4) - #115762 (Explain revealing of opaque types in layout_of ParamEnv) - #115891 (simplify inject_impl_of_structural_trait) - #115932 (Expand infra-ci reviewer list) r? `@ghost` `@rustbot` modify labels: rollup