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

[Jorn Vernee]

On Thu, 2 Feb 2023 18:38:02 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Minor Javadoc improvements

I think `leftmost` is a but 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).

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