Modify merge notification text. Commit ready for merge

 - Legacy-Id: 10725

Author: rpcross

ietf/templates/utils/merge_person_records.txt

@@ -20,6 +20,8 @@ Emails:
 
 You can make changes to your profile here: https://datatracker.ietf.org/accounts/profile/
 
+Reply to this message if this merge should not have happened, or if it produced an incorrect result that you cannot correct by editing your profile.
+
 Thank You,
 The IETF Secretariat
 {% endfilter %}