Add corresponding value to allowInvitesFrom

[juntakata]

This is not related to API changes.

In [External collaboration settings] in Entra ID External Identities. "Guest invite settings" has 4 options.

• Anyone in the organization can invite guest users including guests and non-admins (most inclusive)
• Member users and users assigned to specific admin roles can invite guest users including guests with member permissions
• Only users assigned to specific admin roles can invite guest users
• No one in the organization can invite guest users including admins (most restrictive)

When an admin changed this option, an audit log activity "Update authorization policy" is generated. The audit log shows a property "AllowInvitesFrom" was changed, for example, from 2 to 1. However, there is no doc that explains which number corresponds to which option.

This is why I am adding the corresponding numbers to each option in this PR.

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[learn-build-service-prod]

Learn Build status updates of commit a15f526:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/resources/authorizationpolicy.md	✅Succeeded

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