minikube.md proofreading
minikube.md proofreading

Made a few grammatical tweaks to minikube.md.

att-comdev/openstack-helm,att-comdev/openstack-helm,ss7pro/aic-helm,att-comdev/openstack-helm,andrecolin/openstack-helm,ss7pro/aic-helm,andrecolin/openstack-helm