[foreign-memaccess+abi] RFR: Fix javadoc "highest-order" rather than "upper"

[Maurizio Cimadamore]

On Thu, 2 Feb 2023 18:42:02 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> I think `leftmost` is a bit confusing, since they appear on the 'right' on little endian machines. I think saying highest-order is enough. (though, I think just 'high-order' sounds a little more colloquial, though I'm not sure which one is technically more correct).

It's perhaps not great - but it's backed by precedents (see bitwise methods in Long). Valuing consistency is, I think, important.

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PR: https://git.openjdk.org/panama-foreign/pull/779