macOS install docs: Minikube is a normal Homebrew formula now

[issyl0]

• It was switched from being a Cask in
  minikube 1.5.0 (new formula) Homebrew/homebrew-core#45603.
• Closes Brew Formula for Minikube #2141.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: issyl0
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Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #5750 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5750   +/-   ##
=======================================
  Coverage   37.83%   37.83%           
=======================================
  Files         106      106           
  Lines        7773     7773           
=======================================
  Hits         2941     2941           
  Misses       4452     4452           
  Partials      380      380