[Cache] Adds info about Age response header

[angelampcosta]

Summary

Adds info about Age response header.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added information about the Age response header in the caching documentation.

• Introduced details about the Age response header and its significance in cache responses.
• Clarified conditions under which the Age header is present or absent.

Modified Files

• src/content/docs/cache/concepts/cache-responses.mdx

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[github-actions]

Preview URL: https://60075143.preview.developers.cloudflare.com
Preview Branch URL: https://angela-add-info-about-age-response-header.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cache/concepts/cache-responses/	https://angela-add-info-about-age-response-header.preview.developers.cloudflare.com/cache/concepts/cache-responses/