doc: simplify util.TextDecoder example
This simplifies the example and makes it runnable. (The current example has a magic function.) (This also removes an assignment in a condition which will be flagged if we enable ESLint's no-cond-assign rule.)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This simplifies the example and makes it runnable. (The current example has a magic function.) (This also removes an assignment in a condition which will be flagged if we enable ESLint's no-cond-assign rule.)