Use LLVM 22 defaults in OpenACC extraction script

[ouankou]

Summary

• update the OpenACC extraction script examples from LLVM 20/21 to LLVM 22
• default LLVM_VERSION to 22
• keep the usage text aligned with the new defaults

Testing

• not run (script default/documentation update only)

[ouankou]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 199d0b75eb

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[ouankou]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".