[Cache] Updates limits

[angelampcosta]

Summary

Updates limits. Addresses #21338

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated cache limits documentation to include new information regarding URL thresholds and rate limiting.

• Added note about thresholds for URLs being calculated using a moving average.
• Clarified the use of token bucket rate limiting for purge requests.

Modified Files

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

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[github-actions]

Preview URL: https://9099f234.preview.developers.cloudflare.com
Preview Branch URL: https://angela-updates-limits.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cache/how-to/purge-cache/	https://angela-updates-limits.preview.developers.cloudflare.com/cache/how-to/purge-cache/