[foreign-memaccess+abi] RFR: Update docs [v4]

Wed May 25 18:59:02 UTC 2022

On Wed, 25 May 2022 18:42:59 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This patch updates the README of the foreign-memaccess+abi branch (which will soon become the new default branch for this repo).
>> It also updates the various docs to reflect the latest API changes
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Separated out new text into a subsection

Marked as reviewed by jvernee (Committer).

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