doc: sort bottom-of-file dns markdown links
They were sorted in https://github.com/nodejs/node/pull/12726, but not maintained.
Checklist
-
commit message follows commit guidelines
Affected core subsystem(s)
doc
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
They were sorted in https://github.com/nodejs/node/pull/12726, but not maintained.
doc