Update install.md (#9721)
Update install.md (#9721)

* Update install.md

What should the output of sysctl be?

* Updated the markdown formatting

Updated the markdown formatting and added text to explain the result.

docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io