Solved heater-fault.g and filament-error.g

[oliof]

Reading documentation on triggers, I noticed heater-fault.g and filament-error.g are not listed in the System Macros section in the documentation. I think they should be added, since at least heater-fault.g is kind-of critical.

[droftarts]

@oliof Thanks, I've added a section on these (and the driver error/warnings) to the Macros page that links to the Events page: https://docs.duet3d.com/en/User_manual/Tuning/Macros#errors-and-events

Ian