Deletes extraneous setup guide notes

[dplumlee]

Removes remaining setup guide notes and labels that were accidentally not included in #5095

[github-actions]

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[mergify]

This pull request does not have a backport label. Could you fix it @dplumlee? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• v7.x is the label to automatically backport to the 7.x branch.
• v7./d./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[nastasha-solomon]

Changes lgtm!