[Email Security] Add note about PhishGuard user submissions

[Maddy-Cloudflare]

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PR Change Summary

Added a note regarding PhishGuard user submissions for email reclassification.

• Introduced a note about PhishGuard customer submissions for analysis.
• Clarified submission levels for PhishGuard and non-PhishGuard customers.

Modified Files

• src/content/docs/cloudflare-one/email-security/email-monitoring/search-email.mdx

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[github-actions]

Preview URL: https://833e1194.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-17363.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/search-email/	https://maddy-email-security-pcx-17363.preview.developers.cloudflare.com/cloudflare-one/email-security/email-monitoring/search-email/