Update DIGIPOT_I2C_MOTOR_CURRENTS comments

Marlin/Configuration_adv.h

Marlin/src/config/default/Configuration_adv.h

...src/config/examples/AlephObjects/TAZ4/Configuration_adv.h

Marlin/src/config/examples/Anet/A6/Configuration_adv.h

Marlin/src/config/examples/Anet/A8/Configuration_adv.h

Marlin/src/config/examples/Azteeg/X5GT/Configuration_adv.h

Marlin/src/config/examples/BIBO/TouchX/Configuration_adv.h

Marlin/src/config/examples/BQ/Hephestos/Configuration_adv.h

...in/src/config/examples/BQ/Hephestos_2/Configuration_adv.h

Marlin/src/config/examples/BQ/WITBOX/Configuration_adv.h

Marlin/src/config/examples/Cartesio/Configuration_adv.h

...in/src/config/examples/Creality/CR-10/Configuration_adv.h

...n/src/config/examples/Creality/CR-10S/Configuration_adv.h

...in/src/config/examples/Creality/Ender/Configuration_adv.h

Marlin/src/config/examples/Felix/Configuration_adv.h

...rc/config/examples/FolgerTech/i3-2020/Configuration_adv.h

.../src/config/examples/Infitary/i3-M508/Configuration_adv.h

Marlin/src/config/examples/JGAurora/A5/Configuration_adv.h

Marlin/src/config/examples/MakerParts/Configuration_adv.h

Marlin/src/config/examples/Malyan/M150/Configuration_adv.h