CodeGen from PR 15795 in Azure/azure-rest-api-specs

[Hub Generated] Public private branch 'dev-maintenance-Microsoft.Maintenance-2021-09-01-preview' (#15795)

* Update Maintenance.json

* Update MaintenanceConfigurations_GetForResource_GuestOSPatchLinux.json

* Update MaintenanceConfigurations_GetForResource_GuestOSPatchWindows.json

Author: SDKAuto