[Cache] Update cache-analytics.mdx

[nenizera]

Hello team,

Summary

For more info on how sampling works.

Thanks!

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PR Change Summary

Updated the cache analytics documentation to provide additional information on sampling.

• Enhanced the Requests summary section with a reference to sampling information.
• Updated the documentation to improve clarity regarding traffic changes.

Modified Files

• src/content/docs/cache/performance-review/cache-analytics.mdx

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