Document email-based role mappings

[s-nel]

Summary

We've introduced the ability to define role mappings that match on user email. This PR documents this new capability. Should not merge until https://github.com/elastic/cloud-ui/pull/2990 is merged and deployed in all envs.

Fixes: https://github.com/elastic/cp-iam-team/issues/2910

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Opus/sonnet

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🔍 Preview links for changed docs

• deploy-manage/users-roles/cloud-organization/configure-saml-authentication.md

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Vale Linting Results

Summary: 1 suggestion found

💡 Suggestions (1)

File	Line	Rule	Message
deploy-manage/users-roles/cloud-organization/configure-saml-authentication.md	29	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.

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