src: fix typos in node_lttng_provider.h
Follows https://github.com/nodejs/node/pull/11189
To be considered a breaking change per https://github.com/nodejs/node/pull/11189#discussion_r99509433
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Follows https://github.com/nodejs/node/pull/11189
To be considered a breaking change per https://github.com/nodejs/node/pull/11189#discussion_r99509433