[stdlib][docs] Slightly clarify Hashable docs #58652
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In
hash(into:)docs, clarify that the prohibition on callingfinalize()only applies to the hasher instance that is passed to thehash(into:)method -- it is not intended to forbid callingfinalizein general. Also note that replacing the instance is likewise prohibited.In
hashValue, explain that the compiler will take care of providing a suitable implementation.