[ReleasePR @azure/arm-billing] Update readme.python.md#15976

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openapi-sdkautomation[bot] wants to merge 1 commit intoAzure:mainfrom AzureSDKAutomation:sdkAuto/@azure_arm-billing

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Commits on Jun 24, 2021

CodeGen from PR 14858 in Azure/azure-rest-api-specs
SDKAuto
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