fix(cli): typos on cli and documentation

[tom-fletcher]

Component / Package Name:

This PR contains:

• [ ] bugfix
• [ ] feature
• [ ] refactor
• [x] documentation
• [ ] other

Are tests included?

• [ ] yes (bugfixes and features will not be merged without tests)
• [x] no

Breaking Changes?

• [ ] yes (breaking changes will not be merged unless absolutely necessary)
• [x] no

If yes, please include "BREAKING CHANGES:" in the first commit message body, followed by a description of what is breaking.

List any relevant issue numbers:

Description

I noticed a couple of typos in the cli help, plus associated documentation. Plus a small typo on the CONTRIBUTING.md page

[shellscape]

[tom-fletcher]

Nothing like late-night coding 😉 Don't be too thankful, I may be about to give you a problem!