Integrated: Update README based on feedback

Tue Feb 20 16:03:10 UTC 2024

On Tue, 20 Feb 2024 15:38:01 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> - Change references from jdk 21 to jdk 22
> - Update JEP number and recommend LLVM version
> - Amend instructions for jdk version needed to run gradle
> - Add note that example indicating that a native library is required

This pull request has now been integrated.

Changeset: 3a0b4cf0
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.org/jextract/commit/3a0b4cf0455b408a4cd9225bde9b054ab76242ec
Stats:     9 lines in 1 file changed: 2 ins; 1 del; 6 mod

Update README based on feedback

Reviewed-by: mcimadamore

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PR: https://git.openjdk.org/jextract/pull/222