Rollup merge of #103106 - saethlin:from_exposed_docs, r=thomcc

Try to say that memory outside the AM is always exposed

cc ``@Gankra`` ``@thomcc``

I want to confidently tell people that they can use `from_exposed_addr` to get a pointer for doing MMIO and/or other hardware interactions done with volatile reads/writes at particular addresses outside the Rust AM. Currently, the docs indicate that would be UB.

With this change, now the docs indicate that this is intended to be a valid use of `from_exposed_addr`.

r? ``@RalfJung``

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