[cache] Update purge-everything.mdx

[nenizera]

Hello team,

Summary

Can we warn customers here about potential impacts on their origin server and their application performance due to purge everything?

Thanks!

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PR Change Summary

Added a cautionary note regarding the potential impacts of purging everything on origin server performance.

• Introduced a warning about the effects of purging everything on application performance.
• Highlighted that a cache response marked as EXPIRED may lead to execution delays.
• Emphasized the need for caution when performing a purge everything operation.

Modified Files

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

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[angelampcosta]

He think this note is not necessary, since the page already states "Purging everything instantly clears all resources from your CDN cache in all Cloudflare data centers. Each new request for a purged resource returns to your origin server to validate the resource. If Cloudflare cannot validate the resource, Cloudflare fetches the latest version from the origin server and replaces the cached version."