Added comments explaining change in supply attribute membership in QDM 5.4

[hossenlopp]

No code changes, just comments.

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• [x] This pull request describes why these changes were made.
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• [x] Internal ticket for this PR: https://jira.mitre.org/browse/BONNIE-1602 https://jira.mitre.org/browse/BONNIE-1670
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Bonnie Reviewer:

Name: @edeyoung

• [x] Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• [x] The tests appropriately test the new code, including edge cases N/A
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