This typo had been copied and pasted into numerous irq and syscall headers.
boards/arm/stm32h7/stm32h747i-disco: Remove references to nucleo in the stm32h747i-disco board. arch/arm/include/stm32h7, arch/arm/src/stm32h7, and boards/arm/stm32h7/stm32h747i-disco: Add support for the STM32H747I-DISCO board.
See configs/nucleo-h743zi/README.txt for a detailed description of the state of the port.