[docs] Fix instructions for Java install with Homebrew

Created by: narlei

The current doc use homebrew/cask-cask instructions, and cask was changed.

The current instructions to install java with Homebrew doesn't work, and mysteriously it requests your github email and password 🤔🏴‍☠️. This PR change the docs to install java using https://github.com/AdoptOpenJDK/homebrew-openjdk with correct cask command in homebrew.