[foreign-memaccess+abi] RFR: Update docs [v2]

Wed May 25 17:43:14 UTC 2022

On Wed, 25 May 2022 17:23:53 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> The section about `keepAlive` was removed, but we now have `whileAlive`. Should something about that be added instead?

I toyed with that, and ended up leaving it out, since it seems a bit too deep into the rathole.

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PR: https://git.openjdk.java.net/panama-foreign/pull/688