message: Update OpenApiToCadl execution instructions
diff: @@ -5,13 +5,13 @@ Autorest extension to scaffold a new CADL definition from an existing OpenApi do
  To run it
  ```bash
  -autorest --openapi-to-cadl --input-file=<path-to-swagger> -namespace=<namespace> --title="<ProjectName>" --clear-output-folder=false
  +autorest --openapi-to-cadl --input-file=<path-to-swagger> -namespace=<namespace> --title="<ProjectName>" --use=@autorest/openapi-to-cadl@next
  ```
  or with a README config file
  ```bash
  -autorest --openapi-to-cadl --require=<path-to-readme-config>.md
  +autorest --openapi-to-cadl --require=<path-to-readme-config>.md --use=@autorest/openapi-to-cadl@next
  ```
  This plugin will generate the following files
  