Add kubectl download instructions to minikube.md
Add kubectl download instructions to minikube.md

https://github.com/kubernetes/kubernetes/issues/28171
erictune/erictune.github.io,aidevops/kubernetes.github.io,rata/kubernetes.github.io,ronaldpetty/kubernetes.github.io,rata/kubernetes.github.io,aidevops/kubernetes.github.io,ronaldpetty/kubernetes.github.io,erictune/erictune.github.io,AlainRoy/alainroy.github.io,erictune/erictune.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,rata/kubernetes.github.io,AlainRoy/alainroy.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,aidevops/kubernetes.github.io,ronaldpetty/kubernetes.github.io,aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,AlainRoy/alainroy.github.io