doc:use proper article
Checklist
-
documentation is changed or added -
the commit message follows commit guidelines
Affected core subsystem(s)
Description of change
Refer the Github issue #6642 (closed) https://github.com/nodejs/node/issues/6642
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refer the Github issue #6642 (closed) https://github.com/nodejs/node/issues/6642