Update cache.mdx

[Henry-YiW]

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[hyperlint-ai]

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PR Change Summary

Corrected the description of the If-Modified-Since behavior in the Cache API documentation.

• Updated the If-Modified-Since section to clarify response behavior.
• Ensured accuracy in the Cache API documentation.

Modified Files

• src/content/docs/workers/runtime-apis/cache.mdx

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[kodster28]

confirmed via https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since

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