Confusing wording about SSO Organisations

[huewood]

On the FAQ section for SSO (linked here), the wording around 'Buildkite organisation' is confusing.

A member of our company left and subsequently was removed from the GitHub organisation (which is our SSO provider). I was unsure if I had to remove also from the Buildkite UI.

So I would suggest changing the line to something like: "You will need to manually remove them from your SSO's provider organization. After that, the user will be automatically removed the Buildkite User list.".