Correct a few stability attributes #47030
Merged
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ManuallyDropwere added in Additional traits for std::mem::ManuallyDrop #44310 which was only stabilised in 1.22.0.SliceIndexwere stabilised in Stabilize more APIs for the 1.20.0 release #43373 but asRangeInclusiveandRangeToInclusiveare still unstable the impls should remain unstable.Fromimpls for atomic integers were added in impl From<T> for AtomicT #45610 but most atomic integers are still unstable.shared_from_slice2impls were added in ImplementRc/Arcconversions for string-like types #45990 but they won't be stable until 1.24.0.MutexandRwLockimpls were added in impl From for Mutex and RwLock #46082 but won't be stable until 1.24.0.