macOS install docs: Minikube is a normal Homebrew formula now

- It was switched from being a Cask in
  Homebrew/homebrew-core#45603.

site/content/en/docs/Start/macos.md

@@ -17,7 +17,7 @@ weight: 2
 If the [Brew Package Manager](https://brew.sh/) is installed, use it to download and install minikube:
 
 ```shell
-brew cask install minikube
+brew install minikube
 ```
 
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@@ -40,8 +40,8 @@ curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-darwin
 If the [Brew Package Manager](https://brew.sh/) is installed, use it to download and upgrade minikube:
 
 ```shell
-rm /usr/local/bin/minikube
-brew cask reinstall minikube
+brew update
+brew upgrade minikube
 ```
 
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