Update README based on feedback

[JornVernee]

• 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

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed (no review required)

Reviewers

• Maurizio Cimadamore (@mcimadamore - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jextract.git pull/222/head:pull/222
$ git checkout pull/222

Update a local copy of the PR:
$ git checkout pull/222
$ git pull https://git.openjdk.org/jextract.git pull/222/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 222

View PR using the GUI difftool:
$ git pr show -t 222

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jextract/pull/222.diff

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[bridgekeeper]

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[openjdk]

@JornVernee This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

Update README based on feedback

Reviewed-by: mcimadamore

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[mlbridge]

Webrevs

• 00: Full (bf1be443)

[mcimadamore]

Looks great!

[JornVernee]

/integrate

[openjdk]

Going to push as commit 3a0b4cf.

[openjdk]

@JornVernee Pushed as commit 3a0b4cf.

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