[Email Security] Update Outbound DLP docs

[Maddy-Cloudflare]

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PR Change Summary

Updated the Outbound DLP documentation to include additional licensing information and streamlined the setup instructions.

• Clarified that Microsoft E3 or E5 license is required for Outbound DLP.
• Streamlined the steps to enable Outbound DLP and create an outbound policy.
• Updated the section on DLP Assist add-in for clarity.

Modified Files

• src/content/docs/cloudflare-one/email-security/outbound-dlp.mdx

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[github-actions]

Preview URL: https://25d6d055.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-16837.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/outbound-dlp/	https://maddy-email-security-pcx-16837.preview.developers.cloudflare.com/cloudflare-one/email-security/outbound-dlp/