RFR: 7903128: Overhaul jextract README [v2]

[Maurizio Cimadamore]

On Thu, 24 Mar 2022 13:53:34 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Maurizio Cimadamore has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Simplify dir tree structure
>>  - More fixes
>
> README.md line 33:
> 
>> 31: 
>> 32: ```sh
>> 33: build/jextract/bin/jextract 
> 
> for me the exe is under `build/jextract/jextract.exe` is this different on Linux?

Yep  -this is different on my machine

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PR: https://git.openjdk.java.net/jextract/pull/3