RecipePrototype::hide_from_signal_gui is missing a default value

[Osmo]

https://lua-api.factorio.com/latest/pro ... signal_gui
As far as i know, it is true by default, but the docs say "Default: unset".

[Rseding91]

The default is “unset” and other game logic determines if it sets it to true or false, if an explicit value was not given. So with that information in mind: there is no default beyond “unset”.

[robot256]

Maybe instead of "unset", is could say "nil (auto detect)"

[curiosity]

Should say "nil", yeah. And describe this other game logic below.

[Therenas]

I added an explanation for the next release, thanks for the report.