Reword clarification on lifetime for ptr->ref safety docs #96136
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I believe the current wording of the safety comment is somewhat misleading, and that this is more accurate. Suggested by @CAD97 in this thread on the topic https://rust-lang.zulipchat.com/#narrow/stream/136281-t-lang.2Fwg-unsafe-code-guidelines/topic/Lifetime.20of.20reference.20pointer.20docs.20issue
Just to check that this is correct, CC @RalfJung.
I suppose it's open for interpretation as to whether or not this is more clear. I think it is.