[foreign-jextract] RFR: Refresh docs to reflect Java 18 API changes [v2]

[Maurizio Cimadamore]

On Tue, 18 Jan 2022 15:02:09 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Maurizio Cimadamore has updated the pull request incrementally with eight additional commits since the last revision:
>> 
>>  - Update doc/panama_memaccess.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_memaccess.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>>  - Update doc/panama_ffi.md
>>    
>>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>
> Marked as reviewed by jvernee (Committer).

Thanks for the suggestions @JornVernee!

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PR: https://git.openjdk.java.net/panama-foreign/pull/630