message: Fix C# readme file typo
diff: > see https://aka.ms/autorest
  -This is the AutoRest configuration file for DNS.
  +This is the AutoRest configuration file for Authorization.
  These settings apply only when `--csharp` is specified on the command line.
  Please also specify `--csharp-sdks-folder=<path to "SDKs" directory of your azure-sdk-for-net clone>`.
  