A number of developers new to Urbit have been reading these docs and running these examples, only to realize that booting a moon ships their planets for unknown reasons. This is a simple doc fix that can push people to comets in the meantime. And this is probably easier to do than starting a moon anyways. But maybe all of these docs should point people towards doing these on fake ships? In an ideal Urbit world, dumb examples never sink your planet, but unfortunately this can be the case now, and perhaps we should make that explicit to early developer adopters.