[SRP] update set/get policy example to reflect Nov18 changes.

[huizlAzure]

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[azuresdkci]

Can one of the admins verify this patch?

[sergey-shandar]

Example file has to be a valid JSON file. https://dev.azure.com/azure-sdk/public/_build/results?buildId=9535&view=logs&jobId=5ea8264b-28a6-50c8-6f1c-6d360776db7e