Rollup merge of #121082 - peterjoel:atomic-docs, r=cuviper

Clarified docs on non-atomic oprations on owned/mut refs to atomics

I originally misinterpreted the documentation to mean that the compiler can/will automatically optimise away atomic operations whenever the data is owned or mutably referenced.

On re-reading I think it is not technically incorrect, but specifically mentioning _how_ the atomic operations can be avoided also prevents this misunderstanding.

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