message: Add tag package-2019-08-preview-only for ruby sdk generation
diff: @@ -49,6 +49,16 @@ input-file:
  - Microsoft.DocumentDB/preview/2019-08-01-preview/privateEndpointConnection.json
  ```
  +### Tag: package-2019-08-preview-only
  +
  +These settings apply only when `--tag=package-2019-08-preview-only` is specified on the command line.
  +
  +``` yaml $(tag) == 'package-2019-08-preview-only'
  +input-file:
  +- Microsoft.DocumentDB/preview/2019-08-01-preview/privateLinkResources.json
  +- Microsoft.DocumentDB/preview/2019-08-01-preview/privateEndpointConnection.json
  +```
  +
  ### Tag: package-2015-04
  These settings apply only when `--tag=package-2015-04` is specified on the command line.
  