Modify targetedAuthenticationMethod options

[Justinha]

Updated the targetedAuthenticationMethod property to allow 'Fido2' as a valid option in addition to 'microsoftAuthenticator'.

Beta changes + what's new + changelog #9890

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[learn-build-service-prod]

Learn Build status updates of commit 67044f5:

✅ Validation status: passed

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

For more details, please refer to the build report.

[FaithOmbongi]

Supporting changes #9890