(v7.x-staging backport) doc type fixes
This backports the commits from these PRs to v7.x-staging:
https://github.com/nodejs/node/pull/11167 https://github.com/nodejs/node/pull/11658 https://github.com/nodejs/node/pull/11697
cc: @evanlucas
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This backports the commits from these PRs to v7.x-staging:
https://github.com/nodejs/node/pull/11167 https://github.com/nodejs/node/pull/11658 https://github.com/nodejs/node/pull/11697
cc: @evanlucas