RFR: 7903128: Overhaul jextract README [v7]

[Athijegannathan Sundararajan]

On Thu, 24 Mar 2022 15:37:57 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Maurizio Cimadamore has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - Fix issue with libclang version
>>  - More table tweaks
>>  - Tweak table
>
> README.md line 126:
> 
>> 124: | `--source`                                                   | generate java sources instead of classfiles                  |
>> 125: | `--dump-includes <String>`                                   | dump included symbols into specified file (see below)        |
>> 126: | `--include-[function,macro,struct,union,typedef,var]<String>` | Include a symbol of the given name and kind in the generated bindings (see below). When one of these options is specified, any symbols that is not matched by any specified filters is omitted from the generated bindings. |
> 
> Suggestion:
> 
> | `--include-[function,macro,struct,union,typedef,var]<String>` | Include a symbol of the given name and kind in the generated bindings (see below). When one of these options is specified, any symbol that is not matched by any specified filters is omitted from the generated bindings. |

looks good

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