[AutoPR frontdoor/resource-manager] Update readme.md files missed from previous commit - switching API version to 2019-05-01#6721

AutorestCI merged 2 commits into

restapi_auto_frontdoor/resource-managerAzure/azure-sdk-for-python:restapi_auto_frontdoor/resource-managerfrom

restapi_auto_6900Azure/azure-sdk-for-python:restapi_auto_6900Copy head branch name to clipboard