[ReleasePR track2_azure-mgmt-maps] update readme#19899

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openapi-sdkautomation[bot] wants to merge 1 commit intoAzure:mainfrom AzureSDKAutomation:sdkAuto/track2_azure-mgmt-maps

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Commits on Jul 21, 2021

CodeGen from PR 15284 in Azure/azure-rest-api-specs

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