RFR: Add jextract guide [v5]

[Nir Lisker]

On Tue, 9 Apr 2024 20:15:18 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> doc/GUIDE.md line 8:
>> 
>>> 6: 
>>> 7: Interacting with native C code through the FFM API works
>>> 8: by loading a native library (e.g. a `.so`/`.dll`/`.dylib` file), which is essentially an
>> 
>> Comma after `e.g.`.
>
> You mean add a comma like `e.g., ...`?

Yes.

I meant to put these comment in a longer review, but misclicked. Some remarks are more substantial than others.

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PR Review Comment: https://git.openjdk.org/jextract/pull/231#discussion_r1558267790