A few commands are missing this newline. Instead of fixing those directly,
it's best to ensure there's always two newlines between the command name/signature
and description, as it reduces the amount of location-aware formatting when
constructing RPCHelpMan objects.
While it may be possible to lint this for future changes, the long-term impact of such
a linter is not necessary positive since RPCHelpMan and related code are still undergoing
substantial refactors. We can reconsider as the code matures.