Clarify scope of AllowedToUseSspr parameter

[mcm223]

Updates an example in Update-MgPolicyAuthorizationPolicy.md to clarify scope of the parameter AllowedToUseSSPR. The previous example was flagged by a customer as misleading, as it suggested the parameter affected users instead of administrators. The parameter description does indicate it only affects administrators.

Additionally, the example was modified to show the parameter being set to false, as it is typically enabled by default.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 47aa19e:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoftgraph/graph-powershell-1.0/Microsoft.Graph.Identity.SignIns/Update-MgPolicyAuthorizationPolicy.md	✅Succeeded	View (graph-powershell-1.0)

For more details, please refer to the build report.

[msewaweru]

@mcm223 - Thanks for your contribution. Since the content in this repo is autogenerated, I will make this update from the source to ensure that this update isn't overwritten in the next refresh. Thanks.

I have made the update in this PR and the changes should reflect in the next docs refresh at the end of week.