Update FIDO2 authentication method documentation

[hanki71]

Removed deprecated note and updated HTTP request section.

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Add other supporting information, such as a description of the PR changes:

*This is fixing an inaccuracy. This API does not currently support self-service. Added a note and removed incorrect http request

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[learn-build-service-prod]

Learn Build status updates of commit fd6cb43:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/fido2authenticationmethod-creationoptions.md	✅Succeeded

For more details, please refer to the build report.

[hanki71]

#sign-off