Update platform-sso-macos.md to clarify FileVault policy setting

[cgryba]

Line 232 needs clarification that this setting only applies when the authentication method is set to "Password".

In Intune, when hovering over the "i" icon beside the "FileVault Policy" setting, you are told: The policy to apply when using Platform SSO at FileVault unlock on Apple Silicon Macs. Applies when 'AuthenticationMethod' is Password.

[prmerger-automator]

@cgryba : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

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[MandiOhlinger]

@cgryba Thank you!