Clarify 15MB limit for WAF Content Scanning

[Vortexmind]

The linked page goes to a Cloudflare Gateway page, which has different limits per plan. Adding this comment to clarify that WAF Content Scanning is subject to the 15MB limit on all plans.

[hyperlint-ai]

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PR Change Summary

Clarified the 15MB limit for WAF Content Scanning across all plans.

• Added a note specifying that the 15MB limit applies to all plans for WAF Content Scanning.
• Updated caution section to include the 15MB size limit clarification.

Modified Files

• src/content/docs/waf/detections/malicious-uploads/index.mdx

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