Resolve "chromedriver cask will not install from `make bootstrap` without tapping homebrew/cask"

Ash McKenzierequested to merge
1130-chromedriver-cask-will-not-install-from-make-bootstrap-without-tapping-homebrew-cask into master

What does this Merge Request do?

This MR ensures homebrew/cask is tapped before brew bundle is called on macOS. It also includes some minor wording improvements

Merge Request checklist

  • Tests added for new functionality. If not, please raise Issue to follow-up.
  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Documentation added/updated, if needed.
  • gdk doctor test added, if needed.

Closes #1130 (closed)

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