message: Add code fence
diff: @@ -20,7 +20,7 @@ should have a separate package in a folder, which represents your plugin.
  Example:
  -```
  +```sh
  $ yarn create-plugin
  > ? Enter an ID for the plugin [required] my-plugin
  > ? Enter the owner(s) of the plugin. If specified, this will be added to CODEOWNERS for the plugin path. [optional]
  