[Email Security] Update PhishNet broken link

[Maddy-Cloudflare]

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PR Change Summary

Updated the PhishNet link in the email security documentation to reflect the correct terminology for Microsoft 365.

• Corrected the reference from 'PhishNet O365' to 'PhishNet M365' in the documentation.
• Ensured consistency in naming conventions for email provider references.

Modified Files

• src/content/docs/cloudflare-one/email-security/phish-submissions.mdx

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[github-actions]

Preview URL: https://001463a1.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-fix-link.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/phish-submissions/	https://maddy-fix-link.preview.developers.cloudflare.com/cloudflare-one/email-security/phish-submissions/