Fixed broken link, and wording.
Fixed broken link, and wording.

- Markdown link was not formatted correctly
- Fixed some wording for Nested Virtualization

Signed-off-by: JJ Asghar <46483ceac9440fba9e500d920ac317af9e76f503@gmail.com>

dalehamel/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,dalehamel/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,kubernetes/minikube,kubernetes/minikube,dalehamel/minikube,warmchang/minikube,kubernetes/minikube