[cache] Update purge-by-tags.mdx

[nenizera]

Hello team,

Summary

Per product's name, Tiered Cache.

Thanks!

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PR Change Summary

Updated references to 'Tiered Cache' for consistency in the documentation.

• Corrected capitalization of 'Tiered Cache' in the documentation
• Clarified the behavior of purging by tag in relation to tiered caching

Modified Files

• src/content/docs/cache/how-to/purge-cache/purge-by-tags.mdx

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