docs: update getting-started.md

[davidsneighbour]

Overview

This pull request:

• Fixes a bug
• Adds a feature
• Breaks backwards compatibility
• Has tests that cover changes
• Adds or fixes documentation

Summary

plenty of typos.

[greg-1-anderson]

@Arhell Are docs changes in this repo automatically published to the website project in any way? I don't see anything in CI or the RoboFile that does it; I take it that it's all manual at the moment?

I can build some automation when I have time, just want to make sure that I'm not overlooking anything that's already there.

[Arhell]

@Arhell Are docs changes in this repo automatically published to the website project in any way? I don't see anything in CI or the RoboFile that does it; I take it that it's all manual at the moment?

I can build some automation when I have time, just want to make sure that I'm not overlooking anything that's already there.

Yes, by hand, unfortunately

[greg-1-anderson]

n.b. "isa" was not a typo, but a reference to the "isa" / "hasa" relationship in object oriented design. But "is a" will do as well.