[v12.x backport] doc: standardize on sentence case for headers (!33964) · Merge requests · Rodrigo Test / Test Group-nodejs / node · GitLab

Do not update/delete: Banner broadcast message test data

Do not update/delete: Notification broadcast message test data

Rodrigo Muino Tomonari requested to merge github/fork/Trott/case-12 into v12.x-staging Jun 19, 2020

Backport for #33889