Changes addressed

Mostly related to whitespace (newlines / trailing),
lots of issues remaining to fix in the docs directory.

As usual linting takes most effort when you start,
but from there it is easier to keep code and docs clean.

Closes #3295

The documentation is clearer now for a person new to macOS.

Make it clear that for none, you must be running standard docker.

I needed to run the following 2 commands before `kubectl` worked correctly:
sudo chown -R $USER $HOME/.minikube
sudo chgrp -R $USER $HOME/.minikube

Makes documentation easier to read on narrower screens, and makes the command-line less scary looking. Leaves deletion of the downloaded file as an exercise for the reader. It's typically not done in installation instructions.

Instructions still assume x86-64 architecture, which is the common case, but less than ideal.

This reverts commit 21bfb62ee185fa90448fb57ac92b5ad7643f3ac9.

Signed-off-by: NRaghavendra Talur <raghavendra.talur@gmail.com>

There was a typo in 5a78ac92.

Previously, files installed to /usr/local/bin/ would be owned by the
user executing the command, not root. This change makes these installed
files owned by root instead. Improving security is the goal.