docs: Correct Kosli organization environment variable

[mbevc1]

Updated the environment variable for Kosli organization to reflect username which is a default Org. Also mention what might happen if Organisation doesn't exist.

[sofusalbertsen]

Thanks for the PR.
Let me hear your thoughts:
If you log in through github, then your personal org is = to your gh username.
So it might put people off by asking them about a kosli org, that automatically is created during login.

[mbevc1]

Thanks for the PR. Let me hear your thoughts: If you log in through github, then your personal org is = to your gh username. So it might put people off by asking them about a kosli org, that automatically is created during login.

I see, that wasn't my workflow here and probably why it has confused me a bit 😄 as I was coming in with my Kosli email.

how about we add a note this might reflect your GH user if coming down that path, but it might also be something else?