Since the USB OTG FIFO sizes are partly defined in 32-bit words and partly in bytes, the documentation of the of the USB OTG FIFO size definitions is extended by the respective unit.
Since `esp_can.h` is included by main `cpu/esp32/include/periph_cpu.h` after the include of the specific `periph_cpu_$(CPU_FAM)`, it is not necessary to include `esp_can.h` in each specific `periph_cpu_$(CPU_FAM)`.