Follow up commit for the issue 39827

 - updates documentation on volatile memory intrinsics, now the case of
   zero-sized types is mentioned explicitly.

Volatile memory operations which doesn't affect memory at all are omitted
in LLVM backend, e.g. if number of elements is zero or type used in
generic specialisation is zero-sized, then LLVM intrinsic or related code
is not generated. This was not explicitly documented before in Rust
documentation and potentially could cause issues.

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