[ONPREM-1836] Document other agents requiring hosting in air-gap

[christian-stephen]

Description

A brief description of the changes.

The existing docs missed a couple agents that also require re-hosting.

Reasons

A link to a GitHub and/or JIRA issue (if applicable).
Otherwise, a brief sentence about why you made these changes.

https://circleci.atlassian.net/browse/ONPREM-1836

Content Checklist

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• Break up walls of text by adding paragraph breaks.
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[marcospereira-circleci]

Small suggestions.

[rosieyohannan]

Just a tiny change really!

[christian-stephen]

@rosieyohannan, thanks! Applied your suggestion

[rosieyohannan]

🎉