Minor doc improvements.

[williamtheaker]

This is a pretty minor change is mostly just capitalizing words like Linux.

The only change I think pointing out is in doc/usage.md where the truncate command is changed to use a flag that works on both the GNU implementation and the FreeBSD version shipped with macOS.

[openshift-ci]

Hi @williamtheaker. Thanks for your PR.

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[cfergeau]

Thanks for the thorough cleanups! Minor wording question, apart from this this looks good to me!

[cfergeau]

/lgtm
/approve

[openshift-ci]

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