[foreign-jextract] RFR: Refresh panama documents to reflect API changes [v2]

[Athijegannathan Sundararajan]

On Thu, 23 Sep 2021 15:13:46 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This change updates the memory access/linker markdown documents, to reflect the latest API changes described in [1].
>> 
>> [1] - https://inside.java/2021/09/16/finalizing-the-foreign-apis/
>
> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

Looks good

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Marked as reviewed by sundar (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/578