Rollup merge of #99216 - duarten:master, r=joshtriplett

docs: be less harsh in wording for Vec::from_raw_parts

In particular, be clear that it is sound to specify memory not
originating from a previous `Vec` allocation. That is already suggested
in other parts of the documentation about zero-alloc conversions to Box<[T]>.

Incorporate a constraint from `slice::from_raw_parts` that was missing
but needs to be fulfilled, since a `Vec` can be converted into a slice.

Fixes https://github.com/rust-lang/rust/issues/98780.

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