Follow-up from "Remove suggested_reviewers_bot to per-organization calls"

The following discussion from !205692 (merged) should be addressed:

• @dskim_gitlab started a discussion:

  Perhaps we should leave a note here so that it's what 12 was and why it doesn't exist anymore? Considering the number of approvals this MR had to go through. I think we can do it in a follow up if that makes sense.