[Email Security] Add headers under dispositions

[Maddy-Cloudflare]

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PR Change Summary

Added header structure details for Email Security dispositions.

• Introduced a new section detailing the header structure for Email Security dispositions.
• Specified the format for the disposition header in email messages.
• Clarified that emails marked as SPAM will include a specific tag in their headers.

Modified Files

• src/content/docs/cloudflare-one/email-security/reference/dispositions-and-attributes.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/cloudflare-one/	@ranbel, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://7a5a5b3f.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-18003.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/reference/dispositions-and-attributes/	https://maddy-email-security-pcx-18003.preview.developers.cloudflare.com/cloudflare-one/email-security/reference/dispositions-and-attributes/