Fix: Replace deprecated `experimental_memo` reference with `cache_data` in FAQ

[alexmalins]

📚 Context

The experimental_memo decorator was deprecated in 1.18.0.

🧠 Description of Changes

Replace experimental_memo reference with cache_data in the pandas DataFrame download to CSV FAQ.

Revised:

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Current:

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💥 Impact

Minor fix

Size:

• [x] Small
• [ ] Not small

🌐 References

• [ ] Notion

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.

[sfc-gh-dmatthews]

Thanks!