Add alternative way to secure the vault

[sdwheeler]

Add alternative way to secure the vault

• Fixes AB#226435

[learn-build-service-prod[bot]]

Learn Build status updates of commit 70bbae4:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/SecretManagement/how-to/using-secrets-in-automation.md	:white_check_mark:Succeeded	View (ps-modules)

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