fix: removes extraneous beta disclamer

[baywet]

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Required for API changes:

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• Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE

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[learn-build-service-prod]

Learn Build status updates of commit f54ed32:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/resources/authenticationmethods-usage-insights-overview.md	✅Succeeded

For more details, please refer to the build report.

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