[Fundamentals] Update connection-limits.mdx

[ngayerie]

Summary

Adding details about other limits
Coming from https://developers.cloudflare.com/workers/platform/limits/#request-limits
These limits are not just for Workers

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PR Change Summary

Updated the connection limits documentation to include additional limits related to requests, responses, and caching.

• Added details about request limits, including URL and header size restrictions.
• Included response limits for headers in the documentation.
• Referenced cache limits and provided a link to the cache documentation for further details.

Modified Files

• src/content/docs/fundamentals/reference/connection-limits.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/fundamentals/	@dcpena, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://878a9b37.preview.developers.cloudflare.com
Preview Branch URL: https://ngayerie-patch-20.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/reference/connection-limits/	https://ngayerie-patch-20.preview.developers.cloudflare.com/fundamentals/reference/connection-limits/