Description of changes:
Changes master name references to Admin for GuardDuty admin account, Root for Control Tower central account, and main for primary github branch
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Issue #, if available:
Description of changes: Changes master name references to Admin for GuardDuty admin account, Root for Control Tower central account, and main for primary github branch
By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.