doc: minor style guide updates
Implement two seemingly uncontroversial changes to the style guide that came up during a more controversial pull request.
Checklist
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documentation is changed or added -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Implement two seemingly uncontroversial changes to the style guide that came up during a more controversial pull request.