rust: alloc: clarify what is the upstream version

It may be unclear for readers which upstream Rust version these files
are based on. They may be unaware that they are intended to match the
minimum (and only, so far) supported version of Rust in the kernel.

Thus clarify it.

Reviewed-by: Benno Lossin <[email protected]>
Reviewed-by: Björn Roy Baron <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Tested-by: Ariel Miculas <[email protected]>
Tested-by: David Gow <[email protected]>
Tested-by: Boqun Feng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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