Update cache-responses.mdx

[seaneustace]

Age headers do not appear on Lower Tier HIT that are served from the upper tier cache

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
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PR Change Summary

Updated documentation to clarify the conditions under which the 'Age' header appears in cache responses.

• Clarified that the 'Age' header does not appear for the first request populating the lower tier HIT from tiered cache.
• Specified that the 'Age' header is absent for cache MISS and dynamic traffic.
• Updated language for better understanding of cache response headers.

Modified Files

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

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