RFR: added a note on JDK version to use for Gradle build. [v2]

Thu Sep 22 12:44:53 UTC 2022

On Thu, 22 Sep 2022 12:21:57 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

>> Added missing note to README.md on JDK version required for Gradle version.
>
> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   link to Gradle compatibility matrix page

Marked as reviewed by jvernee (no project role).

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PR: https://git.openjdk.org/jextract/pull/75