[ReleasePR azure-mgmt-billing] [Billing] Update readme.az.md for 2nd phase requests#14979

openapi-sdkautomation[bot] wants to merge 1 commit intoAzure:release/v3Azure/azure-sdk-for-python:release/v3from

AzureSDKAutomation:sdkAutomation/azure-mgmt-billingAzureSDKAutomation/azure-sdk-for-python:sdkAutomation/azure-mgmt-billingCopy head branch name to clipboard