I'm trying to set up Jest for LWC. I have looked at the [documentation][1] and I have looked at the [LWC website][2]. Both of them refer to different packages for Jest installation. Which one should I use? and why? 

  [1]: https://developer.salesforce.com/docs/component-library/documentation/en/48.0/lwc/lwc.unit_testing_using_jest_installation
  [2]: https://lwc.dev/guide/test#install-jest