[AutoPR track2_azure-mgmt-alertsmanagement] update readme#9545

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openapi-sdkautomation[bot] wants to merge 1 commit intomainfrom sdkAuto/18222/track2_azure-mgmt-alertsmanagement

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Commits on Mar 15, 2022

CodeGen from PR 18222 in Azure/azure-rest-api-specs
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